I'm having a very similiar problem to this thread: https://community.tp-link.com/en/business/forum/topic/592190

Namely my iOS and Mac devices will randomly decide they don't like being on the Wifi and will prompt to reenter the password. Sometimes it works and sometimes they will stubbornly refuse to reconnect saying the network could not be joined. 

I have tried all the debugging things I can see in this thread: https://community.tp-link.com/en/business/forum/topic/592190

1) I disabled Wifi6

2) I made sure I was not using WPA3. I tried WPA/WAP2 and WPA2 only

3) I tried creating a 5Ghz only WLAN

4) I've turned off Mac address randomization on the devices

5) I've forgotten the networks and rejoined

6) I've turned off Fast Roaming

I do have a Wifi6 devices on the network, but have disabled Wifi6. I did this by going to the 610's and setting the radio for 5ghz mode to 

Wireless Mode:

802.11a/n/ac mixed -- versus 802.11a/n/ac/ax

I have these devices and firmware

Obviously this is quite a few APs for a residential home, but I have the power set to low on these to try to avoid too much signal overlap. I can't imagine why that would cause such behavior on just Apple devices.

It seems to occur most often when taking a device into another part of the house, so I think it is something to do with roaming or maybe the device is trying to reach the old AP versus the nearby one? 

Any ideas appreciated.