I've often found when receiving a clueless support response like this, it can be effective to just follow up with a polite request to forward the ticket to an engineer or developer. Usually the front-line csr simply hasn't understood the issue. In this case I would say something like,

"Yes, I managed to work around the issue by switching to my personal email address, but this bug is still preventing me from using my work email domain. If you could please forward the error log I included to a developer, it should help them resolve the issue. Thank you."