The Play 5 Gen 1 speaker is NOT compatible with the S2 app. It is only compatible with the S1 app. Have you checked for a system update to see if the 5 needs an update?

https://support.sonos.com/en-us/article/sonos-app-version-compatibility

You can also try to downgrade the other speakers back to the S1 app:

https://support.sonos.com/en-us/article/downgrade-a-sonos-product-to-s1

Many thanks for your response pools-3015,managed to get play 5 (main) speaker working on sonos 1 app and play 3 on sonos 2 app so that,ll do me for now.