Hi there, @surrendertoo.

I am here to help you get this sorted out. Are you getting a specific error when removing an Accountant?

Make sure you have Admin rights to process your request in removing an accountant user. Usually, you're unable to remove an Accountant user in QBO if he/she is the lead accountant. If so, you assign a new lead before you can remove that user as an Accountant.

To make this changes, go to QuickBooks Online Accountant and assign a new lead for this client. 

For more details, please refer to this article: Add or remove an accountant user in QuickBooks Online.

That's it. Keep me posted if there's anything else you need. I'm here to provide additional help.