How do I disable the access point isolation on the router so that I can use Chromecast?
Did you get an answer to this?
I have the same issue with a 2020 UK Vodafone router.
PS Every username I tried came up with "in use" apart from this one !!
The answer appears to have nothing to do with AP control and to do with the Chromecast being on 2.4 and my new Pixel 3A being on 5G with no apparent way of forcing it onto 2.4. I'll find another way. Probably means buying a new Chromcast !!