Yeelight App is not able to find two Lightstrips 1s


I did a reset of my lightstrips 1S because I changed my router and since then I am not able to find them. The curious part is that I also have a normal Lightstrip and two bulbs and all of them are working perfectly.

When I reset the lightstrip I am able to see them in the Wifi but they don’t appear in the DHCP.

I tried with WIFI 2.4GHz and 5GHz and nothing.
I Tried all pings that I saw in other posts: → Doesn’t work → Works well -->> Doesn’t work

I am totally out of ideas, what I can do now?

Thanks in advance.

Edit: I am from Spain.

Hello, this problem seems to be the problem of the router automatically assigning IP. It is suggested to change another router to test and confirm