User has already paid. The feature they had been using was removed.
I'm sorry for the trouble. 1Password no longer offers a free-to-use option on iOS. It can either be used with a 1Password membership account or it can be synced to a standalone vault created by 1Password for Mac or 1Password for Windows. It wouldn't be possible to create a new standalone vault from 1Password for iOS. Standalone vaults still work, but must be created by a licensed product (1Password for Mac or 1Password for Windows).