Grouping field not appearing in Itunes

Hey there,
I am using Crossover to run MP3tag on my Catalina Macbook.
It works great, however the GROUPING field does work in Itunes (or apple music as they call it now). I don't think the comments field does either (i need to test this again).

Any suggestions for this?

Please see the list of supported fields for different file types:
https://help.mp3tag.de/main_tags.html

See if you need GROUPING or CONTENTGROUP or WORK.