I cannot access my job's VPN from home

I have the white Askey router and use multiple VPN services for both personal and work.  A while back some of my VPNs would intermittently connect, and if they did, they were extremely slow.  Around the same time, I started having an issue where some (but not all) of my devices would only be able to get to IPv6 addresses, IPv4 stopped working for those devices.  Tmo Cust Service walked me through a fix which resolved the IPv6/v4 issue as well as fixed the connection to most of my VPNs.
On the white Askey router, go to the (Expert) Network → LTE → Dial-Up Settings area, pick Add APN Profile, and add a new profile with the following settings: APN: fbb.home / Authentication Type: None / PDN Type: IPv4+v6 (this is the key change, the default is likely IPv6) / leave Username and Password blank.  Click the Save button and maybe throw in a power cycle for good measure.

This resolved several of my issues.  That being said, I still have one remaining AOVPN that I haven't been able to figure out yet.