`osc maintainer` lists usernames.
Bugzilla wants email addresses.

Use `osc whois

osc maintainer -e

Thanks Jan and Axel that was a big help!

I had tried putting @<domainname> on the usernames figuring they were just shortcutting in osc and it sometimes worked but now I see that emails are not always username@domain.

They would have been if I set it up 😄