MacOS Catalina 10.15 is not officially qualified yet by Pulse Secure and it has been identified that the host checker components are not working correctly on Catalina. Only way to allow the Catalina is by temp. disabling the host checker restrictions for them i.e. assign a new role which does not any host checker.
Support and Known issues with Catalina was documented here on this KB.
Observed multiple times PDC crash on latest Mac OS Dev beta build with Host checker enabled - Under Investigation.