for your point, but all my answers have been related to @DennisT
The devices were the AP AC LR access points.
When AP Unifi AC Long range (LR) is really different than AP AC Lite, they still have same product list description regarding PoE, need pair type A for 802.3af spec and recommend power supply by PoE adapter, except Unifi switch environment.
I read lot about an incompatibility before my decision to use Unifi environment. But it was more than year ago.
when you put in google: “unifi supported PoE protocols”
you will find this kind of aware from official Ubiquiti web:
All UAP-AC-LRs with a date code of 1624 or board revision 15 and following ones support 802.3af in addition to 24V passive. All UAP-AC-LITEs with a date code of 1624 or board revision 31 and following ones support 802.3af in addition to 24V passive. Board Revision information can be found in the UniFi Network Controller within the properties panel of each UAP in the Details > Overview section.
Note: you can find the date code in sticker from AP package:
Date code means:
first two digits - year ..16 = 2016
last two - week - 41 = 41th week of the year
when someone sold the AP with this mentioned revision without an awareness to Denis, then it was irresponsible seller or seller who doesn’t care about goods, or seller who doesn’t understand what it means. Finaly, most problems come from such seller’s behavior. But I learned from many my mistakes, then need to be prepared to ask the seller about more important questions from preparation research. It was my point from beginning - don’t undervalue the preparation stage, because then is your faul = time lose in roll-out. It is common folk.