Keep being told my Safari login is new, from a Mac I've used for years

Hey PhilipRoy:

Great questions!

There's two parts to your answer. One, the reason why you're receiving an email notification every time you re-launch Safari is because when Safari is set to private mode, 1Password for Safari isn't able to persist what it uses to tell 1Password.com that it's an existing session. Quitting and relaunching Safari means that 1Password.com sees it as a "new" session of your sign in. Disabling private mode in Safari would be your best bet.

As for why you're seeing 10.15.7 as your macOS version on 1Password.com, in short, browser vendors made the decision to cap the reported macOS version in the user agent at 10.15.7. Reporting 11.0.0 for Big Sur and 12.0.0 for Monterey would occasionally cause issues with sites expecting macOS's major version to stay at 10 for the foreseeable future. Because 1Password for Safari is checking Safari's user agent, this results in the same capped macOS version.

Jack