Numeric ID should be UNIX user ID. Quota is tracked based on the way how the access is evaluated, so also check security type. It should be unix.
When users access from Windows to unix security style paths, windows user is mapped to unix user based on name-mapping settings. If this path is accessed thru CIFS, win-unix direction mapping must be configured. You can check mapping using "diag secd name-mapping show", but reverse lookup is not possible. Check how you map each user and determine which windows user should be mapped to this Unix user ID rather than finding such command. https://library.netapp.com/ecmdocs/ECMP1366832/html/diag/secd/name-mapping/show.html