I also have ARC536pro and it will not find the system either. I have it in ARCXT but for some reason ARC536 won't let me import it in from the XT file. I'm not even sure where in RR database the file is located.
The location in Sand Springs is only a single channel, apparently using DMR. So, that can be programmed as a One Frequency Trunked system (OFT). Set it to use ID Search to find any active talkgroups.
For the Tulsa location, program that as a DMR trunked system, and also set it for ID Search. For it to work correctly, you will need to determine the LCNs. To do that, you must have a Department with at least one TGID listed. I simply use TGID as
1 (one). If you don't have a department, with a talkgroup, then the system will not show up in the Analyze/LCN Finder. (You can use ID Search, without a defined department, but the system will not be accessible in Analyze for either System Status nor LCN Finder). You could also just program it as an OFT system, with each frequency shown as a separate site. That would at least let you monitor it for any activity. A department is not required for an OFT using ID Search, but would be needed if you put multiple frequencies in a single site & try to use the LCN Finder.
The Ponca location has two frequencies, so to monitor correctly, you would need LCNs. Follow the same process as noted for the Tulsa site.