Ironically, I’m noticing the exact same problem trying to log in here to report.
Repro:
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Sign in on Twitter somewhere
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Go through a Sign in with Twitter login (for example this forum)
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On the Twitter auth page, select Sign Out
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Once signed out, put in the credentials for a different account, and hit Authorize.
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Error 403 and the error message is:
Whoa there!
There is no request token for this page. That’s the special key we need from applications asking to use your Twitter account. Please go back to the site or application that sent you here and try again; it was probably just a mistake.
I can provide the HAR dump on request.
The process works fine if you are not signed in when you get to the Twitter auth page. EDIT: It also works if you’re already signed in as a user and just reauthorize. So my app is definitely sending in the token correctly, just like it has been doing until this broke. It looks like somehow the sign out is either losing the app token, or then some combined token is invalidated when you sign out.
I have a sneaking suspicion this has something to do with the Sign In With Twitter changes that were made for Tweetdeck Windows EOL (and already broke using web Tweetdeck with SIWT).
@andypiper Any updates on this?