Sorry to hear that you get an error message on your tablet stating the devices are not available until July 1st.
I can see on your account that there is a tablet already registered. If this is the correct tablet that is registered then it should work fine. The error message you are seeing is due to you using your changes this month and the next one is available on the next calendar month which will be July 1st.
If you can go into the TV Anywhere app and pick a stream able channel to watch and see if it works