account has not been verified

Hello,
I am using the WP Members Plugin for an Intranet site. Normally the members did not have to get approved. Today I had to set the tick to “must be approved by admin”. I had to approve all the members again, which I did. Unfortunately now everyone who wants to login got the message: “account has not been verified”. And I have no idea where to verify the members. Am I missing some point?

Thank you for your support and best regards,

The page I need help with: [log in to see the link]