I have been asked to do the following from the company that is hosting our email exchage servers.
To my understanding you are using Xcompany.com as your Active Directory domain. In this case, you will also need to update your internal DNS servers.
All that’s required a change of a CNAME record.
You will need to change:
autodiscover CNAME autodiscover.emailhosting.com.
autodiscover CNAME autordr.emailhosting.com.