Hi

I recently purchased a new iPhone 8 64GB. I've been a Spotify premium user for a while now, mostly via my mobile provider's packaging of plans, but for some reason I cannot get music or even connect to spotify if I am using WiFi on this phone. My iPhone 5S, laptops, TV, AV receiver all connect fine using the same network. I can't see an update of Spotify in the updates list on the app store but I did only just buy this phone. 

The error I get is "Home is not available while you're offline. Please connect to the internet and try again." 

I have tried removing the app, rebooting the iPhone and reinstalling the app but this hasn't fixed anything. If I switch to 4G data I can login and play music fine. If I change to 4G and press play and then switch on wifi it stays connected, although I am not sure if it is still using 4G or not. 

Any help would be appreciated...