No additions to list

I’m seeing that this issue has been brought up a few times but none of the proposed solutions have worked for me.

None of the emails are added to the mailchimp list. I also don’t receive mailchimp emails when I enable the double opt in. I have checked spam, they are not there. I have tried all 3 subscribe events.

As the plugin hasn’t been updated in 9 months would it be safe to assume that it is not compatible with the current WordPress/WooCommerce/Mailchimp versions?