Trying to add Gmail account to bt webmail

[teragram]

When I try to add gmail to my BT webmail I get this error

{
  "id" : "",
  "error" : {
    "code" : 2600200,
    "message" : "Webtop error",
    "data" : {
      "code" : "INTERNAL_ERROR",
      "message" : {
        "parameters" : { },
        "key" : "sdk.common.error.internalError"
      }
    }
  },
  "jsonrpc" : "2.0"
}