unable to connect Floodlight Cam to wifi after provider change - other Ring devices work fine

I have just changed broadband provider...no issues with any Ring kit previously I have two floodlight cams (one front and one rear of house) and doorbell at front. no problems connecting one of the floodlight cams and doorbell to new Vodafone Broadband....both on the front Second one, at rear of house, will not connect to wifi using the ring app, it says "there seems to be a problem with your internet connection" attempting to connect - at about 30% on the progress bar, then fails I have two Vodafone provided wifi boosters set up in the house and working so I know signal strength is fine....wifi strength indicator it shows as green, with just the top indicator bar grey, in the app when going through the steps in the app to connect to it. Speed Test using my mobile next to the camera is 330Mbps Down and 361 Mbps up (it is a 910Mbps connection) I have power cycled everything, multiple times. I have tried two different android phones and an apple pad to attempt to reconnect - all fail at the same point. I am not able to move the floodlight cam closer as it is wall mounted. I have tried moving the router as close as possible. I have turned off firewall on router with no difference to where it fails I'm at a loss...as said above the other two devices are connected and working fine Any ideas? edit....I have also tried holding putton for reset, both the 5 seconds and the 20 seconds, still without success!