I also suffered from this same pain, but on the left side. Deep pain, kind of sharp, on the front, inside panty line area where leg meets the body. Experienced the pain while in triangle, sometimes tree pose and the bent leg during Seated Head to Knee Stretch. It would also hurt trying to get into my car, a jeep.
Hate to say this, but the only thing that helped the pain go away was to stop doing yoga. I know, I know… it’s not what you wanted to hear. I had to stop for a while due to a rotator cuff tear. During that break, as my shoulder healed, the groin pain also healed.
Still don’t know how I caused the leg pain, but it’s gone now.
When I was having the pain, I would just modify the pose and not push too hard on that leg. The only time I experienced the pain was while doing those 3 yoga poses and in/out of the car, so I felt I could live with it.
Sorry I couldn’t offer a magic solution, but sometimes misery just loves company!!
Have fun in your practice!
Barb