Have you tried accessing your account via private browser and making the client inactive?
Just press CTRL+SHIFT+N and then log in to QuickBooks. Then, try deleting the client again.
If you're able to make it inactive, you can go back to your main browser and clear your browser's cache.
Also, using a different browser can be an option, too.
If you're experiencing the same, please contact our Customer Care Support so we can investigate further.
Get back to me if you have further concerns. I'll be here to help.
The issue is that i can not use Private (incognito mode) in my browser.
I always use VPN to get access to my profile because i get the following error if don't do it
This page isn’t working
qbo.intuit.com didn’t send any data.
I appreciate the steps you’ve taken to fix the issue.
Since you’re still unable to remove it, let’s first make sure to delete all projects associated with this client. Also, remove the client from your Wholesale billing. Once done, try to delete the client again then log out and log back in to your QBOA account.
If you’re still unable to delete the client after following the steps above, I’d recommend contacting the support team again for further assistance:
Make sure to reach them out during their business hours (5:00AM-7:00PM (PST) Monday - Friday. 6:00AM-3:00PM (PST) on Saturday).
Drop by again if you have other questions about QuickBooks.