Error when login with oauth custom provider

Docker Compose file configuration:

AUTH_CUSTOM_NAME: Custom
AUTH_CUSTOM_TYPE: oauth
AUTH_CUSTOM_ISSUR: https://mydomain.tld/application/o/tianji/.well-known/openid-configuration
AUTH_CUSTOM_ISSUER: https://mydomain.tld/application/o/tianji/.well-known/openid-configuration
AUTH_CUSTOM_ID: MY_ID
AUTH_CUSTOM_SECRET: MY_SECRET

Logs:

tianji-1    | [auth][error] OperationProcessingError: "response" is not a conform Authorization Server Metadata response
tianji-1    |     at Module.processDiscoveryResponse (file:///app/tianji/node_modules/.pnpm/oauth4webapi@2.11.1/node_modules/oauth4webapi/build/index.js:233:15)
tianji-1    |     at getAuthorizationUrl (file:///app/tianji/node_modules/.pnpm/@auth+core@0.34.1_nodemailer@6.9.8/node_modules/@auth/core/lib/actions/signin/authorization-url.js:19:28)
tianji-1    |     at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
tianji-1    |     at async Module.signIn (file:///app/tianji/node_modules/.pnpm/@auth+core@0.34.1_nodemailer@6.9.8/node_modules/@auth/core/lib/actions/signin/index.js:10:56)
tianji-1    |     at async AuthInternal (file:///app/tianji/node_modules/.pnpm/@auth+core@0.34.1_nodemailer@6.9.8/node_modules/@auth/core/lib/index.js:60:24)
tianji-1    |     at async Auth (file:///app/tianji/node_modules/.pnpm/@auth+core@0.34.1_nodemailer@6.9.8/node_modules/@auth/core/index.js:109:34)
tianji-1    |     at async file:///app/tianji/node_modules/.pnpm/@auth+express@0.5.6_express@4.18.2_nodemailer@6.9.8/node_modules/@auth/express/index.js:141:45
tianji-1    | POST /api/auth/signin/custom 200 - - 167.333 ms
tianji-1    | Error: user.info TRPCError: No Token or Session
tianji-1    |     at file:///app/tianji/src/server/dist/src/server/trpc/trpc.js:90:11
tianji-1    |     at async callRecursive (file:///app/tianji/node_modules/.pnpm/@trpc+server@11.0.0-rc.648_typescript@5.7.2/node_modules/@trpc/server/dist/unstable-core-do-not-import/procedureBuilder.mjs:143:24)
tianji-1    |     at async file:///app/tianji/src/server/dist/src/server/trpc/trpc.js:30:21
tianji-1    |     at async callRecursive (file:///app/tianji/node_modules/.pnpm/@trpc+server@11.0.0-rc.648_typescript@5.7.2/node_modules/@trpc/server/dist/unstable-core-do-not-import/procedureBuilder.mjs:143:24)
tianji-1    |     at async procedure (file:///app/tianji/node_modules/.pnpm/@trpc+server@11.0.0-rc.648_typescript@5.7.2/node_modules/@trpc/server/dist/unstable-core-do-not-import/procedureBuilder.mjs:176:24)
tianji-1    |     at async file:///app/tianji/node_modules/.pnpm/@trpc+server@11.0.0-rc.648_typescript@5.7.2/node_modules/@trpc/server/dist/unstable-core-do-not-import/http/resolveResponse.mjs:249:30
tianji-1    |     at async Promise.all (index 0)
tianji-1    |     at async resolveResponse (file:///app/tianji/node_modules/.pnpm/@trpc+server@11.0.0-rc.648_typescript@5.7.2/node_modules/@trpc/server/dist/unstable-core-do-not-import/http/resolveResponse.mjs:488:26)
tianji-1    |     at async file:///app/tianji/node_modules/.pnpm/@trpc+server@11.0.0-rc.648_typescript@5.7.2/node_modules/@trpc/server/dist/adapters/node-http/nodeHTTPRequestHandler.mjs:70:34 {
tianji-1    |   cause: undefined,
tianji-1    |   code: 'UNAUTHORIZED'
tianji-1    | }
tianji-1    | GET /api/auth/error?error=Configuration 500 - - 3.953 ms
tianji-1    | GET /trpc/user.info?batch=1&input=%7B%7D 401 - - 3.914 ms

Start by reproducing the failure with the supplied Docker Compose OAuth configuration and inspect the custom provider's discovery-response handling around the reported authorization flow. Compare the configured issuer metadata response with the expected Authorization Server Metadata, then verify that sign-in completes without the Configuration and unauthorized-session errors shown in the logs.