I could not reproduce the issue when trying with my own account configuration. Given this may be specific to your account you should provide some additional information, ideally, you should try to reproduce with a test client client application and provide it’s exact configuration including concrete URL’s; you can use localhost based URL’s so that you do not disclose any host information.
Alternatively, you can share the client identifier for which the error is occurring; per OAuth2 the client identifier is not confidential information, but if you’re worried about disclosing it you can always create a client application specific for the issue and then delete it after the root cause of the issue has been found.