Sorry to hear that you have been affected by this issue.
We currently have this raised as an issue and our team are working on getting this resolved, we are waiting for an update from the team on this. Although some customers may be able to use TV go again, have you been able to use it yet?
Sorry for the delayed response here Robifumi. There's a sticky about this here but basically if your cookies/cache are cleared or you're browsing in incognito mode it will cause each instance of TV Go on your browser to be registered as a new device.
In case you still need help resetting the devices I'll get in touch via PM.