IMPORTANT: Always https://docs.microsoft.com/mem/intune/remote-actions/devices-wipe devices associated with that user before deleting the user from Azure AD. (If devices are enrolled with user affinity, Intune manages devices based on the associated user. If the user is deleted prior to cleaning up their devices, Intune's ability to manage the device may become limited.)
Are you able to point me to documentation, or advise what "Intune's ability to manage this device may become limited" means? I can't find anything which explains this at all.
We've got a customer who didn't follow instructions and have ended up with about 8 devices enrolled to a user who has now left. These devices are in remote locations which need to have maximum uptime, so we need to make sure they continue to be managed until remediation can be applied (likely replacement with a correctly set up device - one site at a time).