Re-activate the device in Xfinitywifi

I have one device that was connected to Xfinitywifi and I have removed it from the list of Xfinitywifi devices in my account. I would like to add it again. However, there is no option to add the device.

Now, the other problem is that, the device is not re-connecting to Xfinitywifi (might be because I removed it from the list). Is there any alternative solution to re-connect the device to Xfinitywifi ?