Hello user7446451,
Thank you for reaching out to Constant Contact API Developer Support. My team is here to assist outside software developers with questions about building into Constant Contact's API.
As Power Automate / Microsoft Flow is a 3rd party product and not built or supported by Constant Contact, we are limited in the support we can provide, but will try to answer any questions to the best of our ability as they pertain to Constant Contact’s API endpoints and functionality.
From what we understand, the issue users run into regarding Power Automate / Microsoft Flow not refreshing the token set for the V3 Oauth2 Server Flow is suspected to stem from their system expecting an access token in JWT format. An error seems to occur while attempting to parse the token, which leads to the refresh failure.
I was able to find this related community post in Microsoft’s public Power Users forum that may offer some additional insight on possible resolutions (link below), but if you need further assistance with setting up an Oauth2 authentication within Power Automate / Microsoft Flow in a way that supports refreshing the token set, you’d want to reach out to their support team directly for assistance:
[3rd party link] https://powerusers.microsoft.com/t5/Connecting-To-Data/How-to-connect-custom-API-using-own-OAuth2-in-Microsoft-Power/td-p/787697
However, you may want to postpone troubleshooting that is specific to the current OAuth flow, as there are upcoming enhancements that will be released/announced in the next couple of weeks. These will require some changes to be made to existing V3 apps, which may make the current issue irrelevant. Once these changes are announced/released, please take a look in the updated documentation and feel free to let us know if you have any follow-up questions:
Constant Contact V3 API Release Notes
https://v3.developer.constantcontact.com/api_guide/release_notes.html
Please have a look and let us know if you have any other questions!
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