Update util.py

src/azure-cli-core/azure/cli/core/auth/util.py

@@ -158,7 +158,11 @@ def build_sdk_access_token(token_entry):
     # Importing azure.core.credentials.AccessToken is expensive.
     # This can slow down commands that doesn't need azure.core, like `az account get-access-token`.
     # So We define our own AccessToken.
-    return AccessToken(token_entry["access_token"], str(request_time) + token_entry["expires_in"])
+
+    expires_in = int(token_entry["expires_in"])
+    expires_on = request_time + expires_in
+
+    return AccessToken(token_entry["access_token"], expires_on)
 
 
 def decode_access_token(access_token):