The plan has been pending review for more than 3 weeks

I created an account for one of my clients. I selected the Starter plan. The plan has been waiting for review for more than 3 weeks.
The key is activated, but the plugin has the following error message.

MailPoet is reviewing your subscription. You can use all MailPoet features and send email previews to your authorized email addresses, but sending to your email list contacts is temporarily paused until we review your subscription. If you don’t hear from us within 48 hours, please check the inbox and spam folders of your MailPoet account email for follow-up emails with the subject “Your MailPoet Subscription Review” and reply, or contact us.

I can’t send a newsletter, even though I’ve already created the template. ??