Why am I getting this mesage? Domestic flight, route I have taken before, no changes to my profile or TSA info

Flight tomorrow morning, I tried to check in and got this message. Called Delta, they said it was because I got a complimentary upgrade to FC and just needed to reissue the ticket. A few mins later, the rep came back and said to check in and I still got the error message. She said there is nothing else I can do and have to check in at the terminal.

No changes to my Delta account other than welcome to 2025. No changes to my TSA info. I fly 1-2x month minimum and always seem to have some sort of issue.

Any ideas?

Flight tomorrow morning, I tried to check in and got this message. Called Delta, they said it was because I got a complimentary upgrade to FC and just needed to reissue the ticket. A few mins later, the rep came back and said to check in and I still got the error message. She said there is nothing else I can do and have to check in at the terminal.

No changes to my Delta account other than welcome to 2025. No changes to my TSA info. I fly 1-2x month minimum and always seem to have some sort of issue.

Any ideas?