How do I connected this to my android phone

Btw this is not Amazon support as Amazon support for the A to Z app is at say https://atoz-login.amazon.work/help .. https://accessfaqs.atoz.amazon.dev/index.amazon.faqs.html

You likely got a notification from Amazon that a recent Google Chrome update is preventing passkey sign in on Android. And it suggests to install the Firefox web browser and make it the default web browser on Android like in screenshot at https://support.mozilla.org/en-US/questions/1607391

Did you make Firefox the default web browser on Android as Amazon said. https://support.mozilla.org/en-US/kb/make-firefox-default-browser-android

If you need further help with the A to Z app then perhaps contact Amazon.

It sounds like the main issue is making Firefox the default browser rather than connecting Firefox to the phone itself. Once that is set, the Amazon login link should open in Firefox and hopefully allow the passkey sign-in to work normally.