sonos app update

Hi, I don’t want to moan, But I have just done a app update & wished I hadn’t bothered, Now my Sonos amp won’t connect to my network, I’ve done a factory reset on my amp, I can see all of my other Sonos appliances & when I try & connect my app again it ask me for the passcode on the bottom of the amp witch I have put applied, Know it is saying that amp is not registered  ??