Gosund Smart Plug Not Pairing With New 2.4GHz WiFi Router After Moving House

Gosund socket
Hello warmly, I have searched everywhere but have not found one.
I bought these sockets about two years ago, moved a month ago and installed a new router. On the old router everything worked fine, on the new one not anymore.
2.4 GHz settings, everything according to the instructions. Reset flashes blue quickly, switches to green after a while and that's it as far as the socket is concerned. Manual works, apps don't work, as I checked a few. Sockets don't see it, initiating all the time, passing all the time and not seeing it.
Greetings
Kubiak Leszek

What encryption did you set on the new router? Is it WPA3?
You should have set ssid and password as in the old one then you wouldn't have to configure anything.

What router, what application - have you removed the sockets in it?

The router is a Fritz Box 7530 AX. And the settings available are only WPA2 or WPA2/WPA3, no. The setting was WPA2. Previously I had a Fritz Box 7490, there it worked. Now it sucks. The Smart Life app is the one it worked on, now I've also tried on Gosund and nothing. I've gone through all the options in the instructions and that's it...... There's probably some little nuance I've missed. I have already left the router on 2.4 and am trying further.

Added after 15 [minutes]: .

The router is a Fritz Box 7530 AX . And the settings available are only WPA 2 or WPA2 + WPA3 there is no ssie set was WPA2
Previously I had a Fritz Box 7490 there it worked well
Now it sucks. Smart life application is the one on which it worked now I tried also on Gosund and nothing
I went through all the options in the manual and that was it .......
There is probably some small nuance that I missed .
I have already left the router on 2.4 and am trying further

The network name and password have probably changed.
The socket has the ability to reset the settings to factory defaults?

>>21310453 resets before each pairing attempt, the socket goes through the whole cycle, I think it's good, the apps don't see the sockets. >>21310453 .