Re: error 400 - Unknown or invalid client_id
I don't think this is an issue with Gravity Forms after reaching out to their developers. I am running into the same issue and I get locked out when getting redirected to Constant Contact to connect. Any update or ideas on how to fix this issue?
1 reply
Join Our New Small Business Marketplace!
We're highlighting small businesses from our community. Add your business to the Marketplace to get discovered by new customers and support other entrepreneurs.
Popular Posts:
Small Business Holiday Outlook 2025: Make-or-Break Season! 🚨
What's New in Constant Contact: November 2025 🌟
20 Email Ideas to Keep Customers Engaged Between Sales 🎉