Error "Triying to add unknown device type" or "Pending connection"

I'm having an hard time with a recent launch and my latests Shelly device: "Shelly Pro EM 50"...

I bough this device a week ago which I initally added successfuly to my app/account. Not at first but after a couple of attempts...

Today suddenly this device widgets' started not responding in my Android app, and also didn't display any measurement information. At first I thought it was an app or Shelly cloud problem, but then realised that if I touched other widgets first, these were working properly, and it was when I thouched any of the two "Shelly Pro EM 50" widgets that the app becomes irresponsive.
So I deleted the device and tried to add it again... and that's when everything became even worse!

At my home I've a main AP from the house router and then I've two wireless extenders from TP-Link, with the same SSID.

When trying to add my "Shelly Pro EM 50", I've tried two different things and none of the seems to work, besides I'm not sure which one should be the most reliable or adequate.
As my attemps to add the device do not fully work, I need to reset the device (10s button press) between each attemp, otherwise it is not even listed to be added.

Sometimes I try to add the device through the extender AP which is closest - By selecting the SSID associated to the respective MAC Address.
Most of the time I get a "Triying to add unknown device type. Please try again to confirm. If this error persists contact support to verify the device authenticity." error message.
Screenshot_20231006_182813_Shelly Smart Control.jpg

Sometimes I try to add the device through the main router which is farther - By selecting the SSID associated to the respective MAC Address.
Most of the times I get a screen with "Pending connection", sometimes also the "Triying to add unknown device type..." error message as above.

Screenshot_20231006_181722_Shelly Smart Control.jpg

Any idea how can I resolve this annoying "Pending connection" state?
For the time being my "Shelly Pro EM 50" rests useless...
And I have a second one that I bought yesterday to install as well. I'm looking at it... wondering...


Thanks and best regards,
Fernando

Thank you for the hint!
I never used the WEB-UI before, so I went to find some informatiuon on how to use it.

I had updtate my "Shelly Pro EM 50" at 03.Oct to latest official firmware version available - 1.0.5.

I've now updated it to 1.0.6-beta1 via WEB-UI.

After a few attempets and having always reseted the device, I've also always gotten the "Triying to add unknown device type..." error message.
Maybe if I continue trying, I'll also get the other message... "Pending connection".

Anyway, the latest beta doesn't seem to solve the issue I'm experiencing.

Should I open a ticket to official customer support?