#Error azure-ad provider for NextAuth
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Hmm, I don't know enough to give you a confident answer yet. The knowledge sources provided do not contain information about the specific error you're encountering with the azure-ad provider for NextAuth in Next.js.
However, the error message suggests that the OAuth2 Authorization code was already redeemed. This usually means that the authorization code used in the OAuth2 flow was already used and you need to start the flow again to get a new code.