Can't play content with Alexa on Era 300, works on Roam

Hi.

Just got an Era 300. Sounds great. Enabled Sonos Voice and Alexa from the iOS app. 

Have enabled Apple Music as I have a subscription.

Alexa confirms it is linked to my Amazon account. There’s only 1 in this household.

It respons with correct info re time, date etc.

However, I can’t play anything on the Era 300 with Alexa.

It gives a message asking me to enable the Sonos skill in the Alexa app and then run device discovery.

Have tried both. Including disabling then renabling.

I have a Sonos Roam and this works fine on there. Including playing from other sources, Global Player, BBC etc.

Anything else I can try? Did search forums but not seen a clear resolution.

TY.