Nighthawk AX8 not working with wifi6 phones

Router does not work with our wifi 6 phones. We are lucky if there is any connection and mostly have to disconnect and work on LTE.

Media streams are good and computers work fine but pnones have to run off data as the router just ignores them. Our old basic TP link worked just as well.

Seems Netgear are happy to oversell, but not too sharp on support. There was a similar thread previously that went unresolved.