I’m currently running BigFix 9.5.13 on Catalina and it works, but there could be edge cases, especially around the newer permission model and relevance. You should upgrade Macs to the latest available BigFix agent as soon as possible if not already on 9.5.13 and upgrade again when the new agent is released.
Related:
- I created a fixlet to suppress the Catalina update prompt: https://github.com/jgstew/bigfix-content/blob/master/fixlet/Ignore%20_macOS%20Catalina_%20update%20-%20MacOS.bes
- Sharing Identifying 32-bit Mac Applications