SIM card and pre-paid AT&T plan not working after one year of not using it
I have been using a SIM card with pre-paid AT&T plan until I had to leave the US and live abroad for a year and a half due to COVID. I am planning to go back soon and was trying to activate the plan again. However, when I tried to activate it, the website keeps telling me that the SIM card number is incorrect and that my account in PayGoOnline is incorrect.
I would like to have a phone number and plan paid before going to the US so that I can have access to phone calls right after arriving.
Is there anything I could do to solve this problem?