Gravity forms released version 1.5.1 of the constant contact add-on today which solves the connection issue with Contact Contact - The latest build of the add-on, 1.5.1, available from the downloads page, includes support for the API change Constant Contact has made. To update follow the steps at https://docs.gravityforms.com/how-to-manually-update/
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We are having the same issue using Gravity Forms with Constant Contact integration as @KathleenP027. Gravity Forms does support OAuth2 authorization protocol and the connection was working from the development server. However, after launch we attempted to reconnect with constant contact, we have a valid (Active) application yet we continue to get the error 400 - Unknown or Invalid client_id. See same screenshots as @KathleenP027 plus...
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