Name change & profile picture sync takes weeks

Hello,

When we change a users display name or profile picture, it takes weeks for the change to fully synchronize before it shows the same correct information in Teams, Outlook, SharePoint.

During the week after the change has taken place, the new information can we viewed in Teams but not in SharePoint, and the day after it can be vice versa - and the day after that you could not be able to view the new information anywhere, and then the day after that it could come back to being visible in only Teams. and on it goes.

But after a couple of weeks or a month+, everything comes in order an the new display name or profile picture is correctly visible everywhere.

Why is this happening, and is there some kind of manual sync I could run to get the change to pull thorugh at once? 

Best regards,

Linus