Can't paste password in WalMart app

So I'm at the self-checkout in WalMart today and go to use WalMart Pay like I always do, and for some stupid reason it takes me to the setup screen as if this is my first time using it. Only thing I can think of is I updated iOS earlier that day so maybe that prompted the app to reset something? Anyway, I use 1Password, so I figure - not too big of a deal - let me just open my 1Password app and quickly copy/paste my very long/strong password to the WalMart app. No dice. The d**n password...

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