Problem: Error encountered when WMTS layer is added to Webmap and accessed in Field Map in ArcGIS Enterprise v10.9.1
Steps to reproduce in ArcGIS Portal v10.9.1
Were you able to solve the problem? I have the same problem with Field Maps (AGOL subscription though, not AGS Enterprise) and also with https://wmts.geo.admin.ch/.
The service is accessible and will be displayed in the webmap but not in Field Maps.
I have the exact same issue - follows a recent upgrade to Enterprise 10.9.1. Need to get fixed asap as essentially paying for Field Worker licences we can't use.
This is an issue we have in our backlog to address for the Fall Online release of Field Maps. That will mean it will be addressed in the 11.1 release of Enterprise. This issue is also logged with Support under BUG-000149211; you can contact Support or your Account Manager to have your account associated with the bug to receive updates.
Thanks for the update. Is there a workaround?
Short of reverting to a prior release of Enterprise, there is no workaround for this in 10.9.1 and Field Maps.