Omnitik Station Bridge won't connect to Omnitik AP using NV2

Recently setup small network for an RV park. I used 4 Omnitiks with firmware 5.24

AP1 : setup as AP Bridge, 802.11n 20/40 Mhz HT Above, NV2 protocol, all HT chains selected.
AP2 - AP4 : Setup as Station Bridge, 802.11n, 20/40 Mhz HT Above, any protocol, all HT chains selected.

With this setup AP2 - AP4 will not connect to AP1. But if I change AP1 to 802.11 protocol all AP2-AP4 will connect and pass traffic without issue.

I am running a much larger network using Omnitiks setup same as AP1 and SXT’s setup same as AP2-AP4 and I am not having any issues.

I wanted to use NV2 to increase performance, any idea what may be wrong?