SMT client error with repository SLES12SP5 Updates

I’ve have set and SMT server and a SMT client both on SLES12SP5 which I am evaluating.
I’ve mirrored both the SLES12-SP5-Pool and SLES12-SP5-Updates, and the first seems to be working but the second gives an error complaining about the metadata not being valid: “Valid metadata not found at the specified URL”