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I'm here to ensure you'll be able to add the third user, ss5750077.
If a user did not receive their invitation email, have them double-check their junk mail and spam folder first. If the email is still not found, the user may need to add Intuit as a trusted site to prevent the browser from potentially blocking site content.
Add Intuit: Google Chrome:
Once done, you can hit Resend Invitation again and see if they can receive the email. I'm including these articles to learn more on what other users you can add in QuickBooks Online:
If there's anything else I can help you with, please let me know. I'd be glad to help.