Before your Origami web parts can send emails, admin needs to approve send-email permission.
Here is how to do that:
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Open the SharePoint admin center by going to URL
[tenant]-admin.sharepoint.com. -
Go to the API access page: In the left nav, open Advanced → API access
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Find the pending request
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Under Pending requests, look for the entry that includes Microsoft Graph and the permission Mail.Send (or similar).
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Select the request → then click Approve.
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When a right-side panel opens, click Approve again in the panel to confirm.
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Verify it moved to Approved
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After approval, it should appear under Approved requests on the same API access page.