Hi Pitkin.
What is the build version for your new command asset ? Is it 4.6 or is it 4.5 or lower. I remember I have done some tests with new commands with build version 4.6 that did not appear because TRS2019 requires for commands with build version 4.6 (and probably later) some new UI interface functions to be implemented in the driver commands. If these required functions are not implemented the command is not displayed in the selection menu. Commands with build version 4.5 and lower uses still the same menu interface like before, but can also support the new UI interface functions.
Another question is can you use your new command directly in a driver schedule, or do you have the same problem in a driver schedule than with the schedule library ? In fact does your problem happen only for the schedule library, or does it happen for any schedule (either driver schedule, schedule library, quick portal manager schedules, … ).
Regards.
Pierre.