Reports (report templates that generate a Word doc on the Survey123 Data tab) on Survey123 on AGOL are down. Looks like a site issue, either with AGOL and/or view.officeapps.live.com and/or AWS. I see in the URL they get created on AWS but hosted on live.com. They all generate 404s. These are ones which were working fine yesterday.
Esri AGOL admins, please keep us updated.