Disable "Sign in with..."

Thanks for your prompt response @mruss. Could you answer the below questions so I can gain a better understanding of your set up:

Firstly, can you go to the extensions page in your browser and let me know which version of 1Password you have enabled here?

In addition, are you able to reproduce this behaviour on any other websites? Or is this behaviour specific to Azure?

Finally, I'd like to test to see if the other autofill settings you have in your browser are being respected. If you right click the 1Password icon in your browser toolbar and choose settings and then turn off the setting that says 'Show autofill menu on field focus' and then visit any login form and click into the username or password field, do you still see the suggestion from 1Password? The expected behaviour here is that the suggestion will not show.

Let me know how you get on with the above!