CPanel autodiscover conflict with Exchange

Question

I'm curious how (mostly hosters) are dealing with the cPanel autodiscover conflict? The problem is it seems cPanel uses the same /Autodiscover/Autodiscover.xml setup as Exchange does. When Outlook does an autodiscover lookup it starts in this order:
https://roodomain.com/autodiscover/autodiscover.xml
https://autodiscover.rootdomain.com/autodiscover/autodiscover.xml
http://autodiscover.rootdomain.com/autodiscover/autodiscover.xml
_autodiscover._tcp.rootdomain.com SRV 
So it is not uncommon for someone to have Office365 or another Exchange hosting provider for their email but have a separateweb hosting company for their website (most of the time the company that develops the website ends up hosting it in my case).
So the issue is since cPanel has autodiscover for the root domain Outlook tries configuring that instead of moving on to the CNAME for autodiscover using the redirect method (which is what Microsoft tells us hosters to do).
I don't see a way to disable this autodiscover in cPanel on a per domain level. Just wanted some ideas/inputs from you all

Answer 1

OK, I could be wrong but I think I see the issue. If I understand your setup, you've followed the guide you linked to, and setup IIS to use HTTP Redirect to forward requests it receives onto the final destination. Then on the domain(s) you
want to go to that destination you've added a CNAME for autodiscover.domain.com pointing to that redirection server? Is that right?
Since the order that autodiscover operates is handled by the email client there's no way to change that order. As long as the initial two steps (root domain with https then autodiscover.domain.com with https) fail then the client will move to the third option,
which is why I asked whether if you manually try going to those addresses if it 404s or gives a response. If you get a response then THAT is the issue you need to fix, since that will prevent the client even trying to move to the next method.
Looking through the entire guide, I see in part two it also spells out the records you need to add for the HTTP Redirect method, however that lists adding an A record to the domain for autodiscover.domain.com, not a CNAME. Assuming you've confirmed that
the first two steps are definitely failing so it can proceed to step 3, try changing the CNAME record to an A record instead. I don't know if that will make a difference, but it's the one difference between what you're trying and what is listed in the guide.
Some other guides relating to autodiscover mention adding a CNAME, but those are referring to the CNAME being directed directly to the final destination (as I said previously about pointing to autodiscover.outlook.com), not the method mentioned in this guide.