I am looking to switch the currently running gms 2014 user devices to sync with the newly installed gms2018 server . Since there were issues encountered with upgrade of gms2014 to gms2018, a fresh gms2018 server was installed.

I have over 100+ users who are widely spread with groupwise mobility configured with gms2014 server. How can I achieve a smooth transition for them without requiring to change the server name etc on their devices

The SSL certificate has also been updated on new server with wildcard cert and both the old and new servers have same domain name

Any useful ideas will be highly appreciated