Mailbox migration failed with The connection to the server 'autodiscover.domain.com' could not be completed

Issue:

was trying to migrate a mailbox from office 365 to on premises exchange server 2016.

was getting the following error. 

 "The connection to the server 'autodiscover.domain.com' could not be completed"

Resolution:

As recently i had changed the password of the admin user in the migration endpoint.

so after updating the password in the migration endpoint with the following steps the issue was resolved.

Steps:

login to "https://outlook.office.com/ecp"

then Recipients ---> migration-->click the 3 dots and click on Migration Endpoints. double click on the migration endpoint and update the password.