Not sure if that's a bug, but is this dialog Ok?

[DxJ]

I was testing sending the invites and included an already registered email. Do you know why the HTML tags are there?

[JammyDodger]

This was reported a few days back, and a fix is already in place. If you upgrade to latest it should resolve it for you.

[DxJ]

Thank you @JammyDodger!