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Unable to send email using Send HTTP Request to SharePoint when specifying some users in the TO field

Unable to send email using "Send HTTP Request to SharePoint" when specifying some users
12 hours ago

We have a flow which send emails using  "Send HTTP Request to SharePoint".

I have added "All Users" and "Everyone Except external users" to the sharepoint site. 


For some emails, when we specify in the To field, the flow fails with the below message:


  "message""The e-mail message cannot be sent. Make sure the e-mail has a valid recipient.\r\nclientRequestId: 84eff124-6567-4e19-bb7d-c4305f6a33a8\r\nserviceRequestId: 13976da0-b0ec-1000-aa21-54d3a498bc74",
  "errors": [
It works fine for some users.. The same users which is failing is working fine with some other share point site.
This is the message body
'From' : '',
'To': [',au'],
'Subject': ' Test Email ',
'Body': 'Email Body '
Any idea what is missing here ?

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