NEXTAUTH_URL is set, but still redirects to "commit-url"

[Glutch]

I have published a simple nextauth-user-test website to vercel with discord as only provider.

What i do and what happens

1. Not signed in [Sign in]
2. Redirected to pre-built signin page
3. Click on "sign in with discord"
4. Gets redirected to the SAME PAGE but on my vercel latest commit url "https://project-pq69ayfdp.vercel.app/"
5. Click on "sign in with discord" AGAIN
6. The return_uri is now WRONG because it has pq69ayfdp in it
7. Discord says "invalid Oath2 redirect_uri"

How do i solve this?

Feedback
Documentation refers to searching through online documentation, code comments and issue history. The example project refers to next-auth-example.

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[StefanSelfTaught]

Did you set your NEXTAUTH_URL environment variable on vercel? And maybe you want your redirect_uri to be the same with NEXTAUTH_URL