"TokenError:" error

[wojtekmaj]

In our error monitoring service, we started seeing an error during Sign in with Apple. It started ~15 days ago, and we've seen 3 occurrences so far. It's rather puzzling.

First, I see a failed network request:

https://appleid.apple.com/auth/token [400]

{
http.method: POST
}

Followed by an error in the console:

TokenError: 
    at Strategy.OAuth2Strategy.parseErrorResponse (/node_modules/passport-oauth2/lib/strategy.js:373:12)
    at Strategy.OAuth2Strategy._createOAuthError (/node_modules/passport-oauth2/lib/strategy.js:420:16)
    at /node_modules/passport-oauth2/lib/strategy.js:177:45
    at /node_modules/passport-apple/src/strategy.js:91:25
    at passBackControl (/node_modules/oauth/lib/oauth2.js:132:9)
    at IncomingMessage.<anonymous> (/node_modules/oauth/lib/oauth2.js:157:7)
    at IncomingMessage.emit (node:events:530:35)
    at IncomingMessage.emit (node:domain:488:12)
    at endReadableNT (node:internal/streams/readable:1696:12)
    at processTicksAndRejections (node:internal/process/task_queues:82:21) {
  message: undefined,
  code: 'invalid_request',
  uri: undefined,
  status: 500
}

I tried to reproduce the problem myself, but I failed. Is there anything I could do to debug this further?