What folder is set in account settings > copies and folders for archives for that account? That might offer a clue.

Thanks for the help. The "a" key doesn't seem to work right on yahoo accounts but it works fine with my Gmail, outlook, and gmx accounts. I double-checked the archive setup under copies and folders and it is set up correctly. The "a" key moves the message somewhere just not to the archive folder or anywhere else that I can find.