PMDG 737NGX SDK not working in multiplayer environment

Good evening, pilots!

I recently noticed after using FS2Crew that the PMDG 737NGX SDK does not load in FSX multiplayer environments.  I recently tested this using my own code and found that while the code worked perfectly in single player, it failed to load any data in a multiplayer LAN server.  All other SimConnect data and FSUIPC offsets work fine.

I've done the following steps to identify issue:

Binding a key to Re-Simconnect in FSUIPC (this actually killed SimConnect altogether)

Monitored offset 0x642E (Service Interphone Sw).  Value changes to 0x1 when switch is toggled in single player, but it remains as 0x0 in multiplayer.

Is this a known issue?  Are there any fixes that can be suggested?

Thanks!