[WPMU DEV Dashboard] An Old Client Site is Still Using WPMUDEV Plugins on my account

Hi there,

A client moved their site to another web developer some time ago and they're still access two WPMUDEV plugins (that I know of) through my account.

I no longer have access to the clients site but want to remove access to the WPMUDEV plugins that are being used on my account.

How can I do that? (I've tried to do so via The Hub but the deactivation of Google Analytics+ keeps failing and I can't access the WPMUDEV Dashboard, at all, because the settings icon is greyed out.

Essentially, I want to stop this client accessing these plugins via my account.