Hi,
Can you tell me do you have a paid subscription with Acyba or are you using Free Starter version?
In case you are using free Starter version, please be so kind to open a support ticket on WordPress pages
https://wordpress.org/support/plugin/acymailing/
In case you have a paid subscription, please open a support ticket here: https://www.acymailing.com/support/
Thank you for understanding!