Using Outlook for Android in business environments for email and scheduling
I finally got them to escalate it. So far they have tried blaming my hosting provider (Bluehost) for not having the domain address, e.g. blahblah.com, in the SSL certificate which connects to boxblah.bluehost.com for the secure connection. That does not explain why it did not work as plain IMAP in insecure mode using mail.blahblah.com and I still have no answer for that.
I'll keep going and keep you all posted.