Android phone won't connect to xfinity wifi

Android phone won't connect to xfinity wifi but will connect to truck's wifi.  Everything  else, tablets and tvs, will connect.  I have reset the modem & everything except the phones connected. I have tried all online, including telling the account to recognize the phone and it says it has, but does not.  When I try to manually connect, it disables the connection - tried all available xfinity wifi connections and disables everyone, all are saved again and tries to auto connect and the disables.  

Received update end of January and this began.

Appreciate any help,

Sammie