diff --git a/extensions/matrix/src/matrix/client.test.ts b/extensions/matrix/src/matrix/client.test.ts
index 133e1293db3..b9800dc79be 100644
--- a/extensions/matrix/src/matrix/client.test.ts
+++ b/extensions/matrix/src/matrix/client.test.ts
@@ -1,6 +1,7 @@
 import { afterEach, describe, expect, it, vi } from "vitest";
 import type { CoreConfig } from "../types.js";
 import {
+  getMatrixScopedEnvVarNames,
   resolveImplicitMatrixAccountId,
   resolveMatrixConfig,
   resolveMatrixConfigForAccount,
@@ -97,6 +98,15 @@ describe("resolveMatrixConfig", () => {
     expect(resolved.deviceName).toBe("Ops Device");
   });
 
+  it("uses collision-free scoped env var names for normalized account ids", () => {
+    expect(getMatrixScopedEnvVarNames("ops-prod").accessToken).toBe(
+      "MATRIX_OPS_X2D_PROD_ACCESS_TOKEN",
+    );
+    expect(getMatrixScopedEnvVarNames("ops_prod").accessToken).toBe(
+      "MATRIX_OPS_X5F_PROD_ACCESS_TOKEN",
+    );
+  });
+
   it("prefers channels.matrix.accounts.default over global env for the default account", () => {
     const cfg = {
       channels: {
@@ -172,6 +182,65 @@ describe("resolveMatrixConfig", () => {
     );
   });
 
+  it("rejects explicit non-default account ids that are neither configured nor scoped in env", () => {
+    const cfg = {
+      channels: {
+        matrix: {
+          homeserver: "https://legacy.example.org",
+          accessToken: "legacy-token",
+          accounts: {
+            ops: {
+              homeserver: "https://ops.example.org",
+              accessToken: "ops-token",
+            },
+          },
+        },
+      },
+    } as CoreConfig;
+
+    expect(() =>
+      resolveMatrixAuthContext({ cfg, env: {} as NodeJS.ProcessEnv, accountId: "typo" }),
+    ).toThrow(/Matrix account "typo" is not configured/i);
+  });
+
+  it("allows explicit non-default account ids backed only by scoped env vars", () => {
+    const cfg = {
+      channels: {
+        matrix: {
+          homeserver: "https://legacy.example.org",
+          accessToken: "legacy-token",
+        },
+      },
+    } as CoreConfig;
+    const env = {
+      MATRIX_OPS_HOMESERVER: "https://ops.example.org",
+      MATRIX_OPS_ACCESS_TOKEN: "ops-token",
+    } as NodeJS.ProcessEnv;
+
+    expect(resolveMatrixAuthContext({ cfg, env, accountId: "ops" }).accountId).toBe("ops");
+  });
+
+  it("does not inherit the base deviceId for non-default accounts", () => {
+    const cfg = {
+      channels: {
+        matrix: {
+          homeserver: "https://base.example.org",
+          accessToken: "base-token",
+          deviceId: "BASEDEVICE",
+          accounts: {
+            ops: {
+              homeserver: "https://ops.example.org",
+              accessToken: "ops-token",
+            },
+          },
+        },
+      },
+    } as CoreConfig;
+
+    const resolved = resolveMatrixConfigForAccount(cfg, "ops", {} as NodeJS.ProcessEnv);
+    expect(resolved.deviceId).toBeUndefined();
+  });
+
   it("rejects insecure public http Matrix homeservers", () => {
     expect(() => validateMatrixHomeserverUrl("http://matrix.example.org")).toThrow(
       "Matrix homeserver must use https:// unless it targets a private or loopback host",
diff --git a/extensions/matrix/src/matrix/client/config.ts b/extensions/matrix/src/matrix/client/config.ts
index 55a2f8464f4..3230e82fd77 100644
--- a/extensions/matrix/src/matrix/client/config.ts
+++ b/extensions/matrix/src/matrix/client/config.ts
@@ -9,7 +9,11 @@ import {
 } from "openclaw/plugin-sdk/matrix";
 import { getMatrixRuntime } from "../../runtime.js";
 import type { CoreConfig } from "../../types.js";
-import { findMatrixAccountConfig, resolveMatrixBaseConfig } from "../account-config.js";
+import {
+  findMatrixAccountConfig,
+  resolveMatrixBaseConfig,
+  listNormalizedMatrixAccountIds,
+} from "../account-config.js";
 import { resolveMatrixConfigFieldPath } from "../config-update.js";
 import { MatrixClient } from "../sdk.js";
 import { ensureMatrixSdkLoggingConfigured } from "./logging.js";
@@ -88,10 +92,13 @@ function resolveGlobalMatrixEnvConfig(env: NodeJS.ProcessEnv): MatrixEnvConfig {
 }
 
 function resolveMatrixEnvAccountToken(accountId: string): string {
-  return normalizeAccountId(accountId)
-    .replace(/[^a-z0-9]+/g, "_")
-    .replace(/^_+|_+$/g, "")
-    .toUpperCase();
+  return Array.from(normalizeAccountId(accountId))
+    .map((char) =>
+      /[a-z0-9]/.test(char)
+        ? char.toUpperCase()
+        : `_X${char.codePointAt(0)?.toString(16).toUpperCase() ?? "00"}_`,
+    )
+    .join("");
 }
 
 export function getMatrixScopedEnvVarNames(accountId: string): {
@@ -128,6 +135,18 @@ export function resolveScopedMatrixEnvConfig(
   };
 }
 
+function hasScopedMatrixEnvConfig(accountId: string, env: NodeJS.ProcessEnv): boolean {
+  const scoped = resolveScopedMatrixEnvConfig(accountId, env);
+  return Boolean(
+    scoped.homeserver ||
+    scoped.userId ||
+    scoped.accessToken ||
+    scoped.password ||
+    scoped.deviceId ||
+    scoped.deviceName,
+  );
+}
+
 export function hasReadyMatrixEnvAuth(config: {
   homeserver?: string;
   userId?: string;
@@ -278,14 +297,13 @@ export function resolveMatrixConfigForAccount(
       scopedEnvValue: scopedEnv.password,
       globalEnvValue: globalEnv.password,
     }) || undefined;
-  const deviceId =
-    resolveMatrixStringField({
-      matrix,
-      field: "deviceId",
-      accountValue: accountField("deviceId"),
-      scopedEnvValue: scopedEnv.deviceId,
-      globalEnvValue: globalEnv.deviceId,
-    }) || undefined;
+  const deviceIdSource =
+    accountField("deviceId") ||
+    scopedEnv.deviceId ||
+    (normalizedAccountId === DEFAULT_ACCOUNT_ID
+      ? readMatrixBaseConfigField(matrix, "deviceId") || globalEnv.deviceId || ""
+      : "");
+  const deviceId = deviceIdSource || undefined;
   const deviceName =
     resolveMatrixStringField({
       matrix,
@@ -342,6 +360,16 @@ export function resolveMatrixAuthContext(params?: {
       'Multiple Matrix accounts are configured and channels.matrix.defaultAccount is not set. Set "channels.matrix.defaultAccount" to the intended account or pass --account <id>.',
     );
   }
+  if (
+    explicitAccountId &&
+    explicitAccountId !== DEFAULT_ACCOUNT_ID &&
+    !listNormalizedMatrixAccountIds(cfg).includes(explicitAccountId) &&
+    !hasScopedMatrixEnvConfig(explicitAccountId, env)
+  ) {
+    throw new Error(
+      `Matrix account "${explicitAccountId}" is not configured. Add channels.matrix.accounts.${explicitAccountId} or define scoped MATRIX_${resolveMatrixEnvAccountToken(explicitAccountId)}_* variables.`,
+    );
+  }
   const resolved = resolveMatrixConfigForAccount(cfg, effectiveAccountId, env);
 
   return {
diff --git a/extensions/matrix/src/matrix/monitor/auto-join.test.ts b/extensions/matrix/src/matrix/monitor/auto-join.test.ts
index f3a27db8598..07dc83fe2a6 100644
--- a/extensions/matrix/src/matrix/monitor/auto-join.test.ts
+++ b/extensions/matrix/src/matrix/monitor/auto-join.test.ts
@@ -147,6 +147,33 @@ describe("registerMatrixAutoJoin", () => {
     expect(joinRoom).toHaveBeenCalledWith("!room:example.org");
   });
 
+  it("logs and skips allowlist alias resolution failures", async () => {
+    const { client, getInviteHandler, joinRoom, resolveRoom } = createClientStub();
+    const error = vi.fn();
+    resolveRoom.mockRejectedValue(new Error("temporary homeserver failure"));
+
+    registerMatrixAutoJoin({
+      client,
+      accountConfig: {
+        autoJoin: "allowlist",
+        autoJoinAllowlist: ["#allowed:example.org"],
+      },
+      runtime: {
+        log: vi.fn(),
+        error,
+      } as unknown as import("openclaw/plugin-sdk/matrix").RuntimeEnv,
+    });
+
+    const inviteHandler = getInviteHandler();
+    expect(inviteHandler).toBeTruthy();
+    await expect(inviteHandler!("!room:example.org", {})).resolves.toBeUndefined();
+
+    expect(joinRoom).not.toHaveBeenCalled();
+    expect(error).toHaveBeenCalledWith(
+      expect.stringContaining("matrix: failed resolving allowlisted alias #allowed:example.org:"),
+    );
+  });
+
   it("does not trust room-provided alias claims for allowlist joins", async () => {
     const { client, getInviteHandler, joinRoom, resolveRoom } = createClientStub();
     resolveRoom.mockResolvedValue("!different-room:example.org");
diff --git a/extensions/matrix/src/matrix/monitor/auto-join.ts b/extensions/matrix/src/matrix/monitor/auto-join.ts
index f92b568e2bd..79dfc30f976 100644
--- a/extensions/matrix/src/matrix/monitor/auto-join.ts
+++ b/extensions/matrix/src/matrix/monitor/auto-join.ts
@@ -46,12 +46,24 @@ export function registerMatrixAutoJoin(params: {
     return resolved;
   };
 
+  const resolveAllowedAliasRoomIds = async (): Promise<string[]> => {
+    const resolved = await Promise.all(
+      allowedAliases.map(async (alias) => {
+        try {
+          return await resolveAllowedAliasRoomId(alias);
+        } catch (err) {
+          runtime.error?.(`matrix: failed resolving allowlisted alias ${alias}: ${String(err)}`);
+          return null;
+        }
+      }),
+    );
+    return resolved.filter((roomId): roomId is string => Boolean(roomId));
+  };
+
   // Handle invites directly so both "always" and "allowlist" modes share the same path.
   client.on("room.invite", async (roomId: string, _inviteEvent: unknown) => {
     if (autoJoin === "allowlist") {
-      const allowedAliasRoomIds = await Promise.all(
-        allowedAliases.map(async (alias) => await resolveAllowedAliasRoomId(alias)),
-      );
+      const allowedAliasRoomIds = await resolveAllowedAliasRoomIds();
       const allowed =
         autoJoinAllowlist.has("*") ||
         allowedRoomIds.has(roomId) ||