Twitter login on Vercel fails (creates User but not Account)

[borispoehland]

Hello,

I managed to get next-auth with twitter working on my local environment. Then I deployed to vercel (with all required environment variables set beforehand) and my Google and Facebook Login still work.

However, my Twitter authentication doesn't work anymore. Here's some more info:

• I made sure that the twitter app has https://....vercel.app/api/auth/callback/twitter set
• When logging in via Twitter, a User is created in the database, but not an Account.
• I suspect the problem is that the production version uses different Account fields than my development version, e.g. accessToken instead of access_token. However, I can not check this because I don't see any errors. This is because my Vercel Serverless function window does not log any Twitter errors. Facebook errors are logged though
• The only thing I know is that the kind of error is Callback

Has any of you faced a similar issue before? Thanks for helping!