List Error: Email Address Not Added

i also have the same problem,

we are using an embedded form, and when you put an address in, we get the List Error as described above, but they do actually go into the campaign Monitor List. ( and they get the confirmation email)

i have hidden the Error Text via CSS for now until a fix is found.

I thought about just hiding the error message as well – I’m curious if you run into any problems with that.

I also contacted Campaign Monitor’s support directly. Not much help so far, but I thought I’d post their response here:

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Sorry for the troubles! Often the “turn it off and back on” method works for issues like this. Would you be able to uninstall the integration and then reinstall and see if that works?

Alternatively, within WordPress, when you set up the lightbox, you should see the list settings here: https://cm.d.pr/6pWpwq

Can you ensure that the correct list and client is selected in those settings?

Can you also try the following troubleshooting steps:
1. Please make sure you have the most recent version of the integration installed. You can see the most recent version of the integrations here: https://www.ads-software.com/plugins/forms-for-campaign-monitor/

2. Remove/disable any other plugins in your account, then install the integration again.

3. Check your own browser and network settings to see if there are any firewalls or encryptions that might be interfering with the integration.

I tried deactivating some of my other plugins, but while they were deactivated I was still getting the error message. When I reactivated them (specifically Yoast SEO and WP Smart Preloader) the connection suddenly started working. No idea why!