Deactivate all devices?

I would like to deactivate all the devices associated with my Adobe digital editions account. Disappointly I'm not able to do this from my account settings? I attempted to ask the virtual assistant for help, but when it asked what app I needed help with and I responded with "Digital Editions" or "Adobe Digital Editions" it didn't understand me and eventually kicked me off.

Can I get any assistance here? This is extremely frustrating, users should have the ability to deauthorize devices themselves if there is a hard limit. The devices I need to deauthorize no longer exist, so I'm not able to turn them on and do it myself!