We have got an attribute in Clarity that is API enabled, however, it is not visible on the Modern UX Administration Attributes section.
It is a very old Clarity object that existed prior to the MUX introduction.
Clarity 16.2.1
Something might have gone wrong when initially the object was API enabled.
Run the following statement to check if the object attributes are available at the odf_attr_metadata table
Run the following statement to check if the object is enabled for Field Level Security
If it returns a 0 value, contact support with the output and analysis of the first statement so we can provide a fix