Automatic Key Column Selection and Warning

I have the Users table in the sheet which has the all the emails of the users which i need to use for automation…but the app is automatically assigning Row number column as key and giving me warning which i have marked in the screen attached below. It says data loss can occur if multiple users are creating a record at same time of sort which i get it but I m not understanding why would the appsheet wants to have key column for this Users table which has just the list of emails and Groups …Please anyone help me with a solution for this.
Here is the Screenshot :

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