Nope, I did that because I read it was where the option was.
The only glimpse of an answer I got was a reddit post where I got this.
It’s currently bugged, you should get access to skyriding/dragon riding/dynamic flight at level 10, but if you haven’t previously unlocked it through the DF campaign, you don’t. I ran into this on my other account last week.
You need to go to waking shores and keep doing the campaign until you unlock dragonriding about halfway into the zone. Or create a new MOP TW character and unlock dragonriding there, which is faster.
This comment is from 3 months ago.
Apparently it’s a common bug that has been around since August.