Hi, I’ve installed the desktop application for Windows yesterday and I get the “Authentication Failure” error message after briefly having seen the dashboard. This topic was already discussed and resolved, however I’ve been having this problem yesterday and also today:
I’ve tried 2 different computers (both running Windows 10) and the problem persists on both of them.
Same issue here, Windows 10 as well. Tried reinstalling, different PCs, different accounts but the issue persists. Please fix this asap.
Thank you, that worked. Applying the latest Windows updates did not fix this, so I’ve used these simple commands to import all root certificates and now the app is working:
certutil.exe -generateSSTFromWU roots.sst
Get-ChildItem -Path roots.sst | Import-Certificate -CertStoreLocation Cert:\LocalMachine\Root
This is due to a certificate update which happened on 11/16/2024. The following is only support suggestions made by general users who have posted suggestion on various forums which worked for them
Open a Command Prompt as Administrator then run the following command:
certutil.exe -generateSSTFromWU roots.sst
Get-ChildItem -Path roots.sst | Import-Certificate -CertStoreLocation Cert:\LocalMachine\Root
Perhaps you wanted to reply to a different post? We’ve already solved the problem here 
I was just providing further clarification. Thanks!
I got “Get-ChildItem” is not recognized as an internal or external command" when I tried running the command in Command Prompt as Administrator.
If anyone else get this message or something similar my fix was opening Windows PowerShell 86x as Administrator and running the command there which worked, then I restarted my pc and the Authentication Failure error was gone.
Hope it helps someone. 
Yes, the 2nd command needs to be run in PowerShell, whereas the 1st one can be run both in PowerShell and in standard command line. So the easiest way is to just run both of them in PowerShell.
trying to run this on windows 7 from power shell, first command works great but second gives me
The term ‘Import Certificate’ is not recognized as the name of a cmdlet, function, script file, or operable program
You can import the certificate file (roots.sst) manually without using PowerShell:
mmc > File > Add/Remove Snap-in > select "Certificates" > Add > select "Computer account" > Next > Finish > Trusted Root Certification Authorities > Certificates > right-click All Tasks > Import > select "Microsoft Serialized Certificate Store (*.sst)" in the combobox > select the roots.sst file
(mmc is Microsoft Management Console)
We have released a new version of the Desktop today which should address the issue without the need to do the manual fix. You should get a prompt to update within the next 12 hours. You can force a check earlier by clicking on “Settings”, then “Check” next to the Auto update. Make sure that the Auto update is turned on.