Expert with dual band router

[Unclemonty]

Hi - can anyone please advise on this.

I have a dual band Virgin router.  The Devialet app does not work at all if the 5ghz band is enabled - presumably the reason for this is that my D400 can only work with 2.4ghz, and my iPad/iPhone are connecting to 5ghz, hence cannot 'see' the Devialet - is that correct?

Is there a workaround or should I just leave 5ghz switched off?

Thanks in advance, Paul