Having trouble connecting 2 HS200s to WiFi using Android mobile app.
I already have 2 other HS200s in the house that connected just fine.

They are version 5.6.  The two that do not connect are both version 5.26.

I am using a Google Pixel 6 Pro with latest version of Android.

The app itself is version 3.4.101 build 1302

When I try to add the switch, I select the HS200.

Then I click on Wi-Fi Setup.

It asks if I have it installed and I click Yes.

Asks me if the circle is flashing orange and green.
It is not.  It is just flashing orange.
Reset and restart appear to make no difference.

Disconnecting and reconnect appear to make no difference.

So I just clicked "orange and green" anyways.

Says "Connecting to Smart Switch"
Then I see "Connect to device".
And it says "TP-LINK_Smart Switch_3474"
Those numbers are the last 4 of the MAC address.
So it is definitely the right device.

Then I click connect.

There is a brief popup that says successfully connected.

Then it just sits there at "Connecting to Smart Switch" for a few minutes.

Then it finally fails says it can't connect.

WTF?

Clearly it is finding the device (actually both devices) by MAC address.

And it briefly says it connected.

And again, this problem is only with the version 5.26 switches.  
My newer ones connected first time with zero issues.
My network is all UniFi based.
The wireless access points are U6 Lite.
Both 2.4MHz and 5MHz are enabled and show active connections.