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Go to Sharing Settings and config/add the following:
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Account Sharing Rules
Go to Setup > Sharing Settings > Account Sharing Rules > Click New > Label = Sign In Kiosk > tick Guest user access, based on criteria
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Asset Sharing Rules
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Go to Setup > All Sites > Builder > click Gear/Settings icon (below the Page Structure) > click Check in/out Kiosk Guest User Profile > Object Settings > give permission to the following objects and fields
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