Hi cmaingi,

Receiving an error when sending an invitation to your QuickBooks Online account, is concerning.  However,  this has been reported by other users, so you're not alone.  I encourage you to contact our Customer Care team at 1-855-253-1536 from Monday to Friday between the hours of 9 AM and 8 PM EST. They will be able to add you to the list of affected users, so you'll receive an email notification when it's been resolved.

If you have any other questions, feel free to reach out again. We would be glad to help!