MS Edge won't ask to save my passphrase when I log-in to Passbolt

Hello,

When I log-in to a website with Microsoft Edge, it shows a key in the right of the URL box, and pops-up a form with login and password I just used to log-in to save the credentials.

With the Passbolt passphrase log-in, it won’t.

Am I missing something?

Thank you in advance for you help