Below is Gravity Forms tech support response to me regarding this. I found MailOptin (https://mailoptin.io/article/elementor-form-integration/?utm_campaign=zaplikelanding&utm_source=elementor-forms&utm_medium=constantcontact) works as a temporary alternative solution: "Hi Joel. Constant Contact recently changed their OAuth2 authentication mechanism, and it's not possible to create new apps using the old authentication mechanism, which is still working for existing apps until March 31st. This will require a change in the add-on to use the new Constant Contact OAuth2 implementation for connecting new sites. Our product team has this in their queue already. You'll hear from us again as soon as we have new information. Please understand that it may take longer than average to receive your next response due to the nature and complexity of this issue. In the meantime, if you have any unused old app created (it should be one with the status "Uncopied" https://share.gravityfor.ms/bP473Q ), you can try changing the Redirect URI in the app to the one from your site Forms > Settings > Constant Contact page and generating a new secret. We appreciate your patience and understanding. Thank you."
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