Authentication not possible, can't sign in to my old account
Hello everyone. I had a different account linked to my primary email address and I had this stupid authenticator app on my old phone, which (surprise, surprise) died. And now I am unable to log in because there is literaly no other way to recieve authentication codes. I don't have backup codes, I don't know if I ever had them, I thought it is possible to just get the code via sms, email or any other way, but apparenly not. How can I contact support to either verify my old account sending my ID card or whatever they need to identify me or delete the old account so I can use the old email address for this new account? I also could not log in using my old laptop becase the moment I tried to do so it disconnected me and I can't log in anymore. Also, why isn't this new account syncing stuff from my old laptop's browser on my new laptop's browser? It said it synced but there is nothing in there, no bookmark, no history, nothing. Thanks in advance.
Can you login to the Firefox account via this web page and check the settings and connected devices?
You can open about:sync-log via the location bar to see if recent Sync logs are available. You can upload the file to a website like Pastebin if you can't post the content of the file in a reply.
You can install the About Sync extension in Firefox 72 and newer on desktop to check what data is stored on the Sync server via the about:sync page provided by this extension.
Close and restart Firefox to access the about:sync page added by this extension (see the about:about page for possible about pages).