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Hello Everyone,

There is a scenario for anonymous users. Anybody on internet can fill form for a list.

There is validation for email id column to check duplicate entries. for that I have used calculated field which has lookup function.

If(isNullOrEmpty(lookup("List Name","Email",lblEmail,"Email")),"","Already registered ")

This is not working for anonymous users although I have given "Add items" permission.

Error says "A request for SharePoint data failed. Error details: Access denied.

You do not have permission to perform this action or access this resource."

Please help..

I got to know that, for anonymous users client object model operations are blocked even though they have permission for list/site. May be runtime functions like lookup will make use of client object model.. So it's not working..

Error: The Method “GetItems” of the type “List” with id “{Lists’s Guid}” is blocked by the administrator on the server

Workaround for this is is removing the function GetItems from AnonymousRestrictedTypes using PowerShell:

OR

We can make use of rest API.. It will work for anonymous users.

Hi Frank,

This is like workaround solution. If we want to use Nintex run time function  lookup, need to remove the function GetItems from AnonymousRestrictedTypes using PowerShell:

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