We will need to release the M365 license from source users, around two weeks after the user has been cutover. They are using ERS Day 2 and will also do a domain cutover at the end of the project.
We are happy to convert the mailbox to shared mailbox if required, but needs to try and release the license in the source, to satisfy the Tenant owners.
Is there an impact on ERS and Domain Cutover by removing the license (i.e. removing the mailbox from the source) and/or converting the mailbox to shared mailbox until Domain Cutover has been completed.