Your Nest account won't be found under subscriptions. It should be the email address and password you used to set up your Nest devices before. Have you tried signing in using any of your active email addresses and passwords?
I haven't heard from you in a while so I'll be locking this thread if there is no update within the day. If you have any new issues, updates or just a discussion topic, feel free to start a new thread in the community.
