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Power Automate: SFTP action "Test connection failed"

When I added an SFTP create file action to my Power Automate flow (https://flow.microsoft.com) , I got the following error in the action step, within the designer:

"Test connection failed"

To troubleshoot the Power Automate connection, I had to:
  1. go the Power Automate portal
  2. then "Data"->"Connections" 
  3. the sftp connection was there, I clicked on the ellipsis, and entered the connection info
It turns out, that screen provides more details about the connection error. In my case, it was complaining that "SSH host key finger-print xxx format is not supported. It must be in 'MD5' format". I had provided the sha fingerprint that WinScp shows. Instead, I needed to use the MD5 version of the fingerprint. To get that, I had to run in command line (I was in a folder that had openssh in it):

ssh -o FingerprintHash=md5 mysftpsite.com

To get the fingerprint in MD5 format. I took the string (without the "MD5:" part of the string) and put it in Power Automate where it asks for the host fingerprint.

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