Flows fail when initiated by a non-admin user

Flows initiated by non-admin users fail with the error "Unable to load connection with alias ID <connection alias sys_id>"

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A flow can fail if the non-admin user who initates it does not have access to the http_connection table where the flow is stored. 

Run the flow as a system user because the flow requires access to the connections and credentials.

In the Flow properties, set the Run as as the System user.