Did Amber work with other apps? If you reload the page and try again - does it work?
Check that Amber has network perms, that it's launched, that you have Notification Type = Direct or have nfty installed, update to latest if not helping, ask nostr:npub1w4uswmv6lu9yel005l3qgheysmr7tk9uvwluddznju3nuxalevvs2d0jr5 if still no luck 😉