It all stems from this: https://cs.chromium.org/chromium/src/components/policy/core/common/cloud/device_management_service.cc?rcl=f4d88d5866f89ef111233a3887f76a2de88b1b7a&l=45

There are now more reasons for a 401, including issues with enrollment certificates.

This gets translated into this error code: https://cs.chromium.org/chromium/src/components/policy/core/common/cloud/cloud_policy_constants.h?type=cs&sq=package:chromium&l=98

And then this UMA error, where we only mention the DM token at that point: https://cs.chromium.org/chromium/src/chrome/browser/chromeos/login/enrollment/enterprise_enrollment_helper_impl.cc?rcl=f4d88d5866f89ef111233a3887f76a2de88b1b7a&l=366

And once we get to the message it is totally not linked to other auth errors anymore: https://cs.chromium.org/chromium/src/components/policy_strings.grdp?rcl=4ec4bda8962655d209beb167d0719322fd956fd9&l=28