Hi @Monika V
Please try :
Copy
<AppPermissionRequests>
<AppPermissionRequest Scope="http://sharepoint/search" Right="QueryAsUserIgnoreAppPrincipal" />
</AppPermissionRequests>
This permission lets you query the search add-in based on the user's permissions. This means that search results will be returned based on the user's ACLs.User's
Here is a link for your reference:
https://learn.microsoft.com/en-us/sharepoint/dev/general-development/search-add-ins-in-sharepoint
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Best Regards
Cheng Feng