I can't remove an alternative email address from a users profile. I get unknown error

[italmotech]

I can't remove an alternative email address from a users profile. I get unknown error. I was able to add other emails and remove them but there is one which can not be deleted.

[icrew]

It sounds like this may be an issue that's more likely to get solved by contacting Google Support (see https://support.google.com/a/answer/1047213?hl=en for how) than posting here.