ZeroTier with TAK Tracker

Dudes,

Has anyone gotten TAK Tracker to work over ZeroTier? I've set "Host" to the Network's subnet address, and no dice. I'm having no issues getting TAK Tracker to work on a TAKServer, just can't get it on a seperate ZeroTier network.

Seems like it should be easy. I'm sure I'm making a dumb mistake,

Thanks!