# azure


06/15/2022, 8:52 PM
Hi #azure! I'm having issues authenticating using Workload Identity federation. I tried it out last week and everything worked great. When I run it now, I get a error 255
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Error: code: 255
      error: building auth config: Authenticating using the Azure CLI is only supported as a User (not a Service Principal).
      To authenticate to Azure using a Service Principal, you can use the separate 'Authenticate using a Service Principal'
      auth method - instructions for which can be found here: <>
      Alternatively you can authenticate using the Azure CLI by using a User Account.
I ran this last week and everything worked. Now It's just impossible to get through. I noticed the pulumi cli got bumped a patch version since last week, but I tried to downgrade and that also did nothing. Does anyone have an idea what's going on?