Intune Admin Template Config Profile error

Unable to access/edit an existing config profile. No changes have been made to it since it was deployed and working successfully for months, and it even just deployed successfully to a new computer, but when I try to open it via the Endpoint Admin Center (which is where it was created), I get the following error:

Any advice as to where to begin troubleshooting/regaining access to this? 

TIA,

Bob