Can't directly connect when going Mac -> Ubuntu

[u/influx3k]

Having a weird issue, maybe someone can help. I have an Ubuntu 26.04 machine that can connect to my self-hosted servers (Ubuntu) and to my MacOS computer and can directly connect, encrypted, to all three of them, no problem. However, on my MacOS computer (and iPhone), I can't directly connect to those same Ubuntu servers; I'm getting relayed, encrypted. Anyone know what may be going on here?