I'm trying to clean up Autodiscover a bit in our org to get away from using large SAN certs, and creating SRV records for any non-domain-joined machines to find the autodiscover server. We don't have external clients using Autodiscover, so for now I'm just focusing internally.
With our domain-joined computers when users auto-configure their own mailbox, the SCP lookup is successful and Outlook configures with no issues. No problem there.
However, when a user has other shared mailboxes auto-mounted within Outlook, certificate errors still appear. Does SCP not work for shared mailboxes? I've deleted all autodiscover.<emaildomain> entries and created the corresponding SRV records. However, we have some domains with wildcard DNS entries on *.emaildomain, so I still need to track these down to make sure that these resolutions return a 404 so that it uses the SRV record instead.
Anyway, the thrust of my question: Do auto-mounted shared mailboxes not use SCP?