Active Roles fully supports the creation of Group Managed Service Accounts (gMSAs).
However, Active Roles versions older than 7.4.1 cannot leverage a service account that is a gMSA. It is expected that certain features, especially related to Remote PowerShell connectivity, will not function. Also using gMSA for the SQL agent account in replication will not allow for merge replication functionality. This is an unsupported configuration.
Active Roles v7.4.X supports usage of Group Managed Service Account as Active Roles Service Account. For more information about using gMSA as a service account, see Configuring gMSA as an Active Roles Service account in the Active Roles Administration Guide.