Hi, I’m just about to go onboard and will be at sea until Friday, so will not have an opportunity to follow this up.
I wasn’t able to replicate your issue and on my configuration, wifi clients are able to authenticate to the RUTX, with internet access over wireguard, that persists through failover and switchback.
I suggest you add the detail of your post above to the seperate thread you started, and hope for someone to step in.