hi Tommy, i got this issue too with the same version of SDK.
there is no error log in my console and if i click somewhere outside the box and open it again, the infinite loading is disappear. But it always happen when i do share screen.
I got the same issue. I use zoom web sdk 1.9.9
When I start sharing screen, the loading box of the Zoom Apps would pop up and show an infinite loading icon.
However, if I press on the Zoom Apps icon before sharing screen, the box would load for a little while and show info. After that, whenever I share screen, the loading icon issue would no longer exists.