HI there @bcorrighan,
Welcome back to our Community - sorry that you're having issues with your TVGo once again.
At the end of 2020 we became aware of an issue with TV Go where you’re unable to watch on a device that has been registered even though it has been used before on PC or MacBook. This can cause all slots and changes for the month to be used. You’re currently allowed 5 devices with 3 changes per month.
This is caused when the cookies and cache for TV Go are removed/deleted. This is not a fault and is working as expected. To avoid the situation you simply need to change the settings on your browser to keep the cookies active for TV Go.
We have a dedicated forum thread to help you out here
You'll be able to change your devices once again from the 1st of the month
Cheers