Can't sign in with mastodon.online

[TechD123]

The oauth flow works until I hit "authorize" at which point the following error is displayed:

Missing required parameter: client_id.

I checked the URL that the app opens in the browser for authorization and it does contain a client ID..

https://mastodon.online/oauth/authorize?response_type=code&client_id=REDACTED&redirect_uri=mastodon-android-auth%3A%2F%2Fcallback&scope=read%20write%20follow%20push

Not sure if this an issue with the app or the server.

[FineFindus]

Are you using the app MastodonRedirect? I've had the same issue, which was caused by the app improperly relaying the URL.