Hello there, @CrystalHayes.

I appreciate you letting us know about your experience with accepting invitations in QuickBooks Online.

The issue you're experiencing could be cause by another Intuit account linked to your email. Thus, I recommend to send the invitation via an alternate email address.

However, if the problem persists I suggest contacting our phone or chat support. They can access your account safely and perform additional investigations in a secure environment.

Furthermore, I'm adding this helpful reference to guide you in managing user roles and access rights in QBO:

User roles and access rights in QuickBooks Online

Keep me posted below if you have other QuickBooks-related concerns or questions. I'll be here to help.