I'm trying to add one of the samples sharepoint extensions into my ArcGis map. When I try to do that it returns the following error: Failed to add Extension Pack from the specified address. Ensure Extension Pack is valid and does not already exist. Samples—ArcGIS Maps for SharePoint | ArcGIS When I check the browser's console I see the following error: ERROR: 403 URL: https://la.arcgis.com/proxy?[FILEURL]/manifest.json.txt I made the APP, API and everything as open as possible to find out where is the block, even anonymous usage. No success so far. - I can confirm that I can access the manifest.json.txt through the URL - Arcgis app is registered and I can see redirect URLs from my sharepoint - ArcGis is authenticated successfully thought the App configuration button - ArcGis map is working with the default configuration connected to a sharepoint list - There are plenty of credits available in the organization account What can I do to solve the issue and add a custom extension? Why this error is happening?
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