This thread has many suggested solutions to this error. After experiencing this yesterday, I spent many hours trying to reach Quicken support. First their call back was not working, then the agent I finally reached refused to help me because they claim my version is no longer supported (Desktop Pro 2021, definitely STILL under support). I finally found someone to help... I had to do a program update (Help > Update QuickBooks Desktop). I believe Intuit knew that their last update was flawed (either on purpose or accidently infected) and now requires anyone with this issue to call for help. Also, interesting that they insisted on giving me the spiel about the "new" subscription service (which I was told would have avoided this issue/call). Anyone with this problem should first try to do an update, which may fix the issue. Shame on Intuit for this entire episode!