How to make players gliding with Elytra glow

I am looking for a command that makes players glow once they're gliding with the elytra. I read that players gliding with the Elytra get a FallFlying tag, but I don't know how to pull it of exactly.
I've tried /execute as @a[nbt={tag=FallFlying}] run effect give @s minecraft:glowing 1 but this does sadly not work.
What is the right command for this?


It's FallFlying:true, not tag=FallFlying. You can check things like this by running /data get entity @s.