Found the answer in this thread!
https://app.roll20.net/forum/post/8616110/tokenmod-issue-with-spaces-in-status-marker-names
TLDR, every status icon has a unique name in the format XXXX:XXXXX that you need to reference. You can find those unique names by calling the token-mod help function as follows:
!token-mod --help
As part of the very verbose response it will list all of the currently loaded status icons and their unique names.