Hello @saraelba, thank you for using Paid Memberships Pro!
I had deleted a “test user” and trying to added again
Can you please specify what you mean when you say that you deleted a user? Did you remove their membership level, delete the User object in WordPress, change their status in the Mailchimp audience, or completely delete them from Mailchimp audience?
Can you please find the subscriber in Mailchimp with your test user’s email address (if it exists) and let me know what status that subscriber has?
and trying to added again
Are you trying to add them again by completing the PMPro checkout process again, manually changing their membership level from the WP Dashboard, or by manually adding them to your audience in Mailchimp?