SW2019 licensing services run as a domain user

I have setup a SW2019 license server on our VM farm, got everything working fine when setup as default but our rules state I have to use a specific domain account to run the license services. When I edit Solidnetwork License Manager and Flexnet Licensing Service services to log on as the domain user the server stops issuing licenses. When I start Solidnetwork Licence Manager I get a "Activation Wizard initialization issue: 72" message then I'm told license does not exist for the input serial number and I'm asked to activate the license. Click OK and I get the issue 72 message again. When I go to license Usage tab I'm told "could not get information from this server" Domain account as log on as a service permissions, it also has full R/W access to the solidworks_licence folder and the ProgramData\FLEXnet folder.

Couldn't find documentation on running SW license services as another user, I guess it's a permissions issue, any ideas?

SolidworksAdministration