Connecting to home VPN from outside the network

Has anyone set up OpenVPN and been able to externally connect to it?  I'm able to connect, but the speed immediately drops to nothing (and by that I mean literally bytes/second), so it's functionally useless. I'm currently using the built in OpenVPN on my TP-Link AX6000, and connecting from my Pixel 6 running OpenVPN for Android. 

Things I've tried so far:

• changing the port from the default
• forcing traffic to UDP
• disabled compression

I'm wondering if Cox is doing something to prevent connecting to a VPN from outside the internal network?