I'm happy to see you here in the Community, @David Cameron.
You've got me here to ensure that you'll be able to send an email to invite a user in QuickBooks Online.
To get this hurdle sorted out, I recommend accessing your QuickBooks Online account using a private window and send the invite from there. This can help us determine if the problem is browser-related.
If you're able to send it successfully, you may go back to your regular browser and clear its cache. At times, the stored data can cause unexpected issues in the program like, the one that you've encountered. Eliminating them refreshes the system and fixes the problems.
On the other hand, sometimes the invitation emails can be stored in the spam folder. Please ask the new user to check their spam folder and make sure the invite isn't hiding out there.
If the email isn't found in the spam folder, you may want to try resending the email. This article offers some pointers on what to do if the person you invited didn't receive their email: Learn what to do if invited users did not receive, or can't find, your email invitation to use Quick...
Lastly, you may check out these resources below to give you more insights about modifying users access and on what are their different access rights that you can grant in QuickBooks Online:
I'm always here to help if you have any other concerns with QuickBooks. Just leave a reply below. Have a great day.
