Is there a way to force logout the WPMU Dash on all my sites?

Hello,

I have a client that I do not want using my developer license. They secretly took a complete backup of their site and left my company. With this backup, they retain access to my account.

Can I block this website/websites? Can I force logout all of my websites, so I can change the password, preventing another login? Can I change my license api key?

How can I prevent these sites from keeping the dashboard logged in, and using my developer license to continue to get updates?

Thanks!