In an email to season-ticket holders, the Arizona Cardinals have canceled season tickets for the upcoming season. Season-ticket holders would get the first opportunity to purchase tickets if single-game tickets become available
"...As for the regular season, it is not clear at this point how many spectators – if any - will be permitted to attend Cardinals home games in 2020. As such, all previous season ticket sales have been voided." the email said.
Fans could also request a refund via a link that was included in the email.
More info here