I'm troubleshooting some on-prem technology that uses pam web service and uses EWS/autodiscover to look up and impersonate mailboxes for scheduling/calendaring purposes.
I'm finding that it's working fine for on-prem mailboxes (Exchange 2010/2007), and used to work fine against an O365 mailbox but is not working for O365 mailbox anymore.
This tool is supposed to go through https://autodiscover-s.outlook.com/Autodiscover/Autodiscover.xml
for looking o365 mailbox up for impersonation but it's failing with an error message "The Autodiscover service couldn't be located.".
It used to work but I'm not sure when it stopped.
I noticed in O365 admin center that Exchange is having some issues in service health section like Service degradation. there was a mention of calendar/free/busy issue there, but I'm not sure if that's related to EWS or Autodiscover from on-prem to O365...