We have been in the process of rolling out Windows 10 (1903) VDI machines using Citrix and FSLogix for profile containment (only FSLogix). Most of the users' profile folders (Desktop, Documents, Downloads, etc) are redirected to a file server. Teams works great except for one function, when a user clicks "Open Downloads Folder" within Files-->Downloads it does nothing and when hitting the Download option on a file you get the "Downloading.." popup but nothing ever appears in the user's Download folder. Looking at the Downloads section under Files-->Downloads it shows the file as perpetually "Downloading".
I used ProcMon to identify Teams looking at the registry under: Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell. The redirected Downloads folder is identified there as being located on the file server share (\\FILESERVER\Redirected$\user\Downloads). If I change it to the default location of %USERPROFILE%\Downloads and create a Downloads folder in the root of the user profile, restart explorer.exe and Teams, it works.
I have scoured the internet and haven't found anyone else with this issue. Anyone else doing folder redirection for Downloads? Is folder redirection not supported in Teams?
UPDATE: Apparently, just creating the Downloads folder in the profile allows downloading to work, the Open Downloads Folder button continues to do nothing. Files download to the correct redirected folder location. So for some reason Teams needs to see the Downloads folder in the root of the profile even if it isn't used?