A fully managed end-to-end service for digitally signing code, documents, and applications. (formerly Trusted Signing)
I think Azure Support is the next step before resubmitting. Another request for the same entity won't help while this one is In Progress. In the Azure portal, click ? (Help), describe the issue, then Create a support request. Include the validation ID, both errors, used-link message and error time (UTC). Ask whether the validation is still pending or has failed, and whether it can be reset/retried or needs a new request.