You've likely solved this issue by now, but I've been through a few posts about this issue and found the answer to be:
With the MacBook on, and bluetooth on (but headphones off) you simply need to press and hold the headphones power button down for a couple more seconds longer then is required to turn them on. That extra two seconds or so must do something that the MacBook picks up because the bluetooth headphones will immediately pop-up in the MacBook bluetooth devices window.
Bluetooth Headphones Mac
Jul 26, 2019 Best Wireless Bluetooth Headphones for 2019. Our editors hand-picked these products based on our tests and reviews. If you use our links to buy, we may get a commission. Shop for apple bluetooth headphones at Best Buy. Find low everyday prices and buy online for delivery or in-store pick-up. Connect a Bluetooth device with your Mac Connect your Mac with a Bluetooth keyboard, mouse, trackpad, headset, or other audio device. Make sure the device is turned on and discoverable (see the device’s manual for details). On your Mac, choose Apple menu System Preferences, then click Bluetooth.
Enjoy premium sound quality or create music with ease. Shop headphones, earphones, speakers, and microphones from Apple. Buy online and get free shipping. Feb 27, 2019 Connecting Bluetooth headphones to Mac for the first time is done by following a few easy steps: On your Mac, click on the Apple menu and launch System Preferences Navigate to the Bluetooth menu and Turn Bluetooth On. You should now see all available Bluetooth devices around you. Mar 20, 2019 On your Mac, Choose System Preferences - Bluetooth. Choose the headphone you are trying to pair from the list of options available. In case your mac asks for passkey or password, enter 0000. Your Mac and Sony headphone will now be connected. You may also hear the voice confirmation if your Bluetooth headphone supports the functionality.
Just click the 'pair' button and you're done.
And I agree with Michael12000, LousyFool is apparently a Mac enthusiast, but the posts seemed rather arrogant and not at all helpful.