Error resolution department

My return was accepted 2/3

 

called today after seeing no updates on the refund site or app, said my return is in the error resolution department. Couldn’t tell me what the error was because she explained the letter hasn’t been sent. If the letter had been sent, she could see the reason. Anything like this happened to others?  Could it be that they are trying to fix the issue and that’s why a letter hasn’t gone out yet? She said could take 6 weeks before I even see a letter.