way to force photo refresh in Teams?

Joseph Hanke Hey, this isn't easy to explain and I'm sure someone can do it better so I'm just going to attach a couple of links. The first one describes the process for profile picture synchronization in Microsoft 365
https://support.microsoft.com/en-us/office/information-about-profile-picture-synchronization-in-microsoft-365-20594d76-d054-4af4-a660-401133e3d48a 

User photos are stored in the user's Active Directory account and in the root directory of the user's Exchange mailbox and this is the PowerShell command to set it.
https://docs.microsoft.com/en-us/powershell/module/exchange/set-userphoto?view=exchange-ps#description

By the way, sometimes the deletion of Teams cache folder seem to help %appdata%\Microsoft\Teams (entire folder) and sometimes a manual sign out / sign in quickens it (top right corner).

Hope it helps!