Hello there.
Congratulations on getting into wheel! That must have felt amazing.
Even though some teachers recommend that you try to keep your feet close to one another and slightly turned in, sometimes you need to adjust to accommodate your body’s needs. When you try the pose again, move your feet a little farther apart and turn them out slightly. If you don’t get the same knee pain, then the next time you do it, move your feet a tiny but closer. Work on taking small steps without the pain in the knee.
I hope that helps!
David