I finally probable got what is happening.
But sadly won't be able to get it to work

I just bought this new eufy x10 vacuum cleaner robot and couldn't connect it.
So more investigations were done.

The problem is not the router.
The problem is that the captive portal I am connected to is only 5Ghz.
So I think that despite using 2.4 on beryl, it won't be able to do this conversion. It is only labeled as 2.4.

Thanks for those who to tried to help.