Firstnet not connecting through VPN

In trying to establish a PepVPN connection from a BR1 Max Mini to a FusionHub, with the VPN built in INcontrol2, I am stuck on a starting status. I did notice the Cellular connection was reporting a private IP of 10.X.X.X.X so I reached out to Firstnet and they have provided me a custom APN to enter and when I do enter the APN I get a Public IP address. However, the VPN status is still stuck on Starting and I am now longer able to browse or remote into the BR1 mini until I push a factory reset, which clears my custom APN.

Has anyone set up a Firstnet connection before that had similar issues or know of any ports, settings, etc that need to be configured for Firstnet?

Thank you in advance.

Of course, as soon as I post this I find the solution. The MTU needed to be lowered to 1342 or less. this fixed my ability to remote in and established the VPN.