I have been watching the site every few days and this morning the tickets for April and May are available.
I have been trying to purchase tickets, but like many others, none of my credit cards were accepted.
When I did mine this morning, the website asked for my cell number, then my credit card company sent me a verification code. You need to make sure your credit card company has your cell #, the same way they notify you if there’s an issue with a purchase or fraudulent activity. I used the credit card that still does travel notifications, so that is already noted on the account.
Thanks for the tip! Just bought mine. I got a verification code to my credit card but it otherwise went smoothly.