We have an issue where active directory attributes do not pull through to Yammer when some users launch Yammer the first time. We sync our on premise AD to Azure and have all AD fields populated. When I check in Azure or Admin Portal, the users details are all there, eg. Firstname = "John", Lastname = "Smith", but on Yammer it shows that "johnsmith" has just joined, not "John Smith". When I then check the user's profile on Yammer, all fields are blank. This only happens for some users, not all.