Hi Courtney,    Thank you for the reply. I did happen to come across that Microsoft post a few weeks ago. Unfortunately, it looks like that user has direct access to the underlying API itself, so he/she was able to modify the API authentication method to work with Microsoft Flow.    From what I'm seeing in the OAuth docs, it looks like the Client Credentials Flow needs to be specifically supported by the API in order for this type of unattended API call to work.    https://auth0.com/docs/get-started/authentication-and-authorization-flow/which-oauth-2-0-flow-should-i-use     ... View more

Has there been any resolution to this issue? I'm trying to use Microsoft Flow to automate various Constant Contact API calls on a regular schedule so we can pull information into a database. Looking at the Swagger definition for the CC API, it appears that the OAuth2 Client Credentials flow is still not supported.    My Microsoft Flow works for a handful of minutes/hours, but it requires me to manually refresh the connection every day by logging into my account via web browser using the "accessCode" flow.    This obviously isn't sustainable, so any help is greatly appreciated. We really need a way to pull our data from the CC API automatically without human intervention!  ... View more