Hello,

Enabled the OEM unblocking on pixel device.

When trying to unblock the bootloader, nothing happens.

Im using an older macbook air model with usb-c to usb -a. And using macOS 12.

What might be my issue?

Are you using a supported browser? From the GOS install page:
Chromium (outside Ubuntu, since they ship a broken Snap package without working WebUSB)
Vanadium (GrapheneOS)
Google Chrome
Microsoft Edge
Brave