Help me, Obi-Wan

I know that double posting is bad form, but I am getting desperate. I use a lot of esp8266 devices, (esp01, Wemos and NodeMCU), in my Home Assistant. But my projects have all come to a halt because I can’t get any of them to connect to WiFi. I am really stumped for any ideas.
Here’s my original post.

Since that post:
I have reset my router to the original settings - no change.
I have installed the Arduino IDE on a PC that never had it before - no change.
I changed the AP name on the router - no change.

As I said in the above post:
I can log my esp’s on to my phone as a hot spot.
I can flash Tasmota to my esp devices and then get a WiFi connection.

I know this is the wrong place to post this, but I am completely out of ideas and in this group are some of the smartest people I know.

Thread closed.