Just did some testing around this and I see that error message in my test instance if I don't set the .com portion of the domain in the setting. i.e. if I just type in gmail instead of gmail.com then I'll get that error. What should show an error message like Please use an @gmail.com email address instead of Please use an @gmail email address.
Screen Shot 2015-08-12 at 10.26.32 AM.png
However, it is entirely possible that the email domain isn't being read correctly. What I would suggest is go back to the domain setting (https://FQDN/admin/features) and type in gmail.com again then save. Regenerate the invite URL and try to sign up again. if you continue to get an error with the domain set correctly, please reach out to HC Server support at support.atlassian.com and we can investigate further.
Atlassian HipChat Support
Badges are a great way to show off community activity, whether you’re a newbie or a Champion.Learn more
As part of the Bitbucket product team I'm always interested in better understanding what kind of impact the use of our tools have on the way you work. In a recent study we conducted of software devel...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs