FYI, it appears that "all access" does not include Secret Lair cards. If you would like to play a card that only appears in a secret lair, you will need to own that card.
@MagicOnline Is it a bug that the All-Access Accounts for Eternal Weekend can't use Secret Lair cards? I tried several times to put in an SL card and it wouldn't let me. Now that we have mechanically unique SL cards with TWD this is kind of important.
Have been informed that this is not a bug, which seems a little silly to me. Especially with the TWD cards.