Apple Pay on MacBook Air won’t show fingerprint prompt in Safari

On a Macbook Air (Sequoia 15.5), in Safari Version 18.5 (20621.2.5.11.8), when Apple Pay is selected as a payment option, the Apple Pay popup will not load the fingerprint icon in order to complete the purchase.

• Fingerprint works for other things, such as signing into my Apple account to submit this question.
• If I select "Pay with credit/debit card" I am able to insert my card info with my fingerprint.

[Re-Titled by Moderator]

Original Title: Apple Pay not Working