Stop 1P username popup on web form

We have a web form for 2FA that's looking for a code to be entered, but 1P insists on popping up the username dropdown for logging in to the site. The form element follows all the rules from https://developer.1password.com/docs/web/compatible-website-design so what else could be triggering it? And how do we stop it?

HTML of the form field:


1Password Version: 7 & 8
Extension Version: Not Provided
OS Version: Win 10/11
Browser:_ FF/Edge tested

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