Unexpected error when adding new GZT admins

Hey LFagni and Moombas,

I've asked a member of our Zero-touch team about the error message and the interesting thing is they did actually update the prompt last year based on the community feedback here, to help highlight that the email address isn't a Google account. 

 This is what the text string should show, when adding an new user:

From the screenshot you have shown here LFagni, it doesn't appear that this showed, so I wonder if you might be able to provide a little more context on how to reproduce this so we can see if something is not quite working as expected? (Or anyone else who may have seen the the error message 'An unexpected error has occurred...')

Thanks so much,

Lizzie