diff --git a/pkg/iam/oidc/service.go b/pkg/iam/oidc/service.go
index b92601657..bd3b93fb4 100644
--- a/pkg/iam/oidc/service.go
+++ b/pkg/iam/oidc/service.go
@@ -146,8 +146,9 @@ var (
 	}
 
 	microsoftEndpoint = oauth2.Endpoint{
-		AuthURL:  "https://login.microsoftonline.com/common/oauth2/v2.0/authorize",
-		TokenURL: "https://login.microsoftonline.com/common/oauth2/v2.0/token",
+		AuthURL:   "https://login.microsoftonline.com/common/oauth2/v2.0/authorize",
+		TokenURL:  "https://login.microsoftonline.com/common/oauth2/v2.0/token",
+		AuthStyle: oauth2.AuthStyleInParams,
 	}
 )