Welcome to the Community space!

I appreciate the steps you've performed, and I understand the importance of adding users to your QuickBooks Online (QBO). I'd like to redirect you to the best support group available to get this resolved.

I'd suggest reaching out to our QuickBooks Support Team. They are equipped with the necessary tools to securely check your account and help you with your concern.

Moreover, I'm adding this helpful article to help you manage their roles and limit their access to specific tasks inside QBO: User roles and access rights in QuickBooks Online.

Return to this post if you have other concerns about adding users in QBO. I'll be here to lend a hand.