Occasional Contributor

My yammer instance is in new Yammer, M365 native mode, we are enforcing Office 365 identity, and blocking users without a Yammer license. 


When a new user in created in O365, and we assign their Yammer license, it appears that they cannot be "@"mentioned in Yammer or added to a Yammer community until after they access/logon to Yammer for the first time.  Is that the case?  Is there a way to pre-add them to communities or tag them before their Yammer initial logon?  Thanks!