Missing decks in library

I received an Account Expiry notice that my decks will be deleted but when I login I can’t find any decks-- all I see is “default.” It’s been this way for several months, I assumed they were gone, but Anki seems to think I have some to delete so maybe it can find them for me and I can use them again?

Logging in to your account 6 months ago will have marked it as active - expiry warnings are currently sent out even if your collection has no cards in it.