I don’t understand why my stand rings are not closing in hours where I am very active. Am I supposed to sit and wait for 50 minutes? I’m just not getting my Standering’s to close.

You don't need to wait the 50mins. It is looking for steps taken in an hour. If you are active, but not walking then it will not necessarily count. The watch want's to see a good hundred steps or so to count for the hour. You don't need to walk far but it needs to be steps.

If you want to maximise on stand hours, you could go for a 5 minute walk at 10:58 finishing at 11:02 and in this time you will achieve the stand goal for both 10 and 11 o'clock. Next walk required will not be required until 12:58.

You have to move your Apple Watch arm. You do not physically need to be standing or even vertical. It is the arm movement that counts.

If you stand and walk with your arm basically stationary, it will not count.