I haven't installed the new Foxfi version yet. If I'm reading correctly, since I don't use nor do I want to use a lockscreen, you have to go into the Foxfi settings and activate "no lockscreen" under the hash code. This may continue to bring up the Verizon authorization, but you can ignore it as we do right now.
Let me know if I'm missing something.
Finally got around to needing Foxfi while on vacation. Followed the directions by opening the Foxfi app then going into settings, clicked on hash code and entered "nolockscreen" and ok. Activated the Foxfi Wifi Hotspot and sure enough, it gave me the Verizon subscription overlay. Just back out of that and Foxfi works as normal without having to use the dreaded lock screen. Yessssss.