Thanks for the reply @Vincent-TP, when trying to use the speaker airplay appears to be trying to connect then an error message says " the device cannot be used" it does not give any error codes that...

I have two Denon Home speakers. One is connected by cable to ETH ports on EAP655, the other one connected via WiFi, they are on VLAN40 (for media), I activate mDNS service for AirPlay and my devices...

@Clive_A is the recommendation to downgrade from firmware 1.0.5 is valid for SG2210XMP-M2(UN) V1.0 as well? The switch stopped authenticating with radius server after the update. thanks!