I appreciate your prompt response, @andpixels.
I want to ensure you'll be able to remove the tax notification that is showing up on your end.
Disabling and archiving the MO tax forms should eliminate the tax notification on your QuickBooks. Since the issue persists after trying the given steps above, I'd suggest getting in touch with our Customer Care Team. This team is the best resource for such concerns as they have the ability to do a remote viewing session that can help verify what's causing the issue.
Also, here are some good articles that you can check out about archiving forms and changing primary state in QuickBooks Online for your future reference:
This should get you pointed in the right direction.
Feel free to reach back out to me should you need anything else about QuickBooks. I'd be happy to help you out. Have a great day ahead.
