Is it possible to use multiple O365 accounts to send out of. There is only room for one in configuration. I have other accounts that within a forms process I would like to use as a reply address. These are separate accounts and not aliases. Using aliases of the listed account works fine.

I've tried granting the one listed account in forms settings full access and send as permissions on the reply to addresses I'd like to use. I've tried validating with the reply addresses as well. Most of these would be shared mailbox accounts.