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When do reserve-ahead tix for Vatican Museums/Sistine Chapel become available?

I was following Rick's advice and trying to book the open (self-guided) tour of the Vatican Museums & the Sistine Chapel for our Rome visit in Sept. 2020. I went to the website (www.museivaticani.va) & followed the links to reserve tickets. However, when it came to the part asking what date I wanted the tickets for, the only choices were Feb., March, or April. Is it only possible to reserve tickets 3 months in advance? (I didn't see anything about this in Rick's book.) There is only one day that will work for us, so I want to be sure to get the tickets ASAP. (I tried e-mailing, using the e-mail addresses on the website, but I got a "mail delivery failure" for both addresses given.)
Thanks for any help you can provide!
Pat