Teams Desktop APP doesn't start - white GUI

[Gabriele Bochem]

Hi, my Teams Desktop App doesn't start - I always get a white GUI. 

The problem is the SSO. My userid for Windows includes a #.  So I think the App gets an error with this special sign. I  would lik to force the app to bring the sign in GUI, but I didn't find anything.

Do you have an idea how to force the desktop app to go to the sign in window an to stop the SSO?

APP version is 1.2.00.1758

Thanks a lot :)

[#2]

Hi!

There is a string with several possible causes and fixes here

https://techcommunity.microsoft.com/t5/Microsoft-Teams/Blank-screen-when-opening-Teams-app-on-window...

Could be one of these. If they don’t work then I would recommend raising a support case with Microsoft.

To note, one of the solutions was changing the username so you may want to try this. It is recommended to generally avoid using special characters such as # in usernames where possible.

Hope that answers your question!

Best, Chris

[#3]

Hi,
Did you get the answer?
One more question, is your user profile located in different location/path than the default one under C:\Users ?

[#4 · Accepted solution]

I FIXED IT!!!  I have been banging my head on this for what seems like forever and then I found this.

"Close out of teams completely. On Windows 10, in your search menu, search Email & Accounts. I noticed that the people that had the issue had their windows accounts missing here. I clicked Add a work or school account under the accounts used by other apps section. Then had them log in.

Teams would immediately log in without the issue. I tried logging out and restarting the PC and had them log back in and it stayed fix. Doing more testing but seems promising for me so far."

[#5]

I too encountered the dreaded blank/white Teams logon dialogue.  Canceling out gave me error code - 4c7.  If I let it time out after five minutes I got error code caa7000a.

My fix: Uninstall Teams, delete everything in Credential Manager, then delete Teams folders from the user's profile.   Reboot, then re-install teams.  The folders I deleted were:

• C:\Users\xxx\AppData\Local\Microsoft\Teams
  C:\Users\xxx\AppData\Roaming\Microsoft\Teams

[#6]

@Sheriff_Andy_Taylor 

In the end I managed to solve my problem more simply. I had tried quitting and restarting Teams several times, but always got back to the white login dialog - sometimes it faded as though busy and unresponsive. However, the Teams main window was there in the background - I found that I could click on the profile icon and select "Sign out". Teams shut down. Next time I started, I was able to sign in successfully.

[#7]

@Gabriele Bochem 

Just change the line of the file:

C:\Users\YYYYY\AppData\Local\Microsoft\Teams\setup.json

line:

{"--exeName":"Teams_windows_x64.exe"}

change to:

{"--exeName":"Teams_windows.exe"}

that's all.