In all the pairs I own it's some arcane combination to enter pairing mode, and then have you tried adding BT headphones to windows when the same ones were paired in the past? You have to remove them first then go back into pairing mode again. It's more bullshit than I'm willing to deal with. With a jack you plug them in and they work.
If they are(or were) connected to my laptop and phone and both devices are nearby, then they will default to my phone. There is nothing I can do on my laptop to force them to connect there instead(and believe me I tried). I have to either remove them on my phone(pain) or enter pairing mode and re-pair them with the laptop(even greater pain).
Work phone, personal phone, work laptop, personal laptop, tablet, desktop.
Good luck pressing that button five dozen times to take the call on your work phone after using them with your desktop, only to find out that your glorious BT device only has 4 memory slots like a videogame from 1991, and unlinked your work phone when you used them with your tablet.