I am getting this error when I enter a user from M365. This user does not have a PowerApps license. But I have been able to use other users who don't have a licnese either and it works fine.
Your posted screen is blank (so I cannot see the error). What sort of control (I assume a Combo Box) are you using for the input and what is its Items, DefaultSelectedItems and rhe Update od the Data Card ?
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