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I am following this article to create a subsite from workflow.

I am getting following error

{"error":{"code":"-2147024891, System.UnauthorizedAccessException","message":{"lang":"en-US","value":"Access denied. You do not have permission to perform this action or access this resource."}}}
0

Have you granted the workflow full crontrol on collecteion level? If not that's more likely the reason.

Find the workflow app id (Between | and @) here: /_layouts/15/appprincipals.aspx?Scope=Web

Enter the app id here: /_layouts/15/appinv.aspx

Enter this xml in the xml field (No placeholders):

 <AppPermissionRequests AllowAppOnlyPolicy="true">
 <AppPermissionRequest Scope="http://sharepoint/content/sitecollection/web" Right="FullControl" />

Hit the create button.

Now in the workflow put the http request in an App step

Full guide here: https://docs.microsoft.com/en-us/sharepoint/dev/general-development/create-a-workflow-with-elevated-permissions-by-using-the-sharepoint-workflo

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