Hi,
after successfully adding a group to the team folder I've created (thanks again to Greg and Sdrawko) I also tried to remove that very group afterwards using
/2/sharing/remove_folder_member
with the following json parameter:
{ "leave_a_copy":false, "shared_folder_id":"3032413665", "member": { ".tag":"dropbox_id", "dropbox_id":"g:159b846c7487bd9000000000000011b3" } }
After executing the method I receive the following JSON response:
{".tag": "async_******_id", "async_******_id": "dbjid:AADFNCNH28N0hbWG2XEZIoDfOFJCnCE39h6D2rl8mjhqO-GrQXauw9XEhVl1xgyT5ma9Z8h56s8vKddwPaPNhqaB"}
Which seems to be as expected.
Unfortunately after listing the team folder groups the group I want to remove is still present at the team folder.
Since there's no documentation to be found on how to fetch the status of the async ****** using REST calls I've no idea how to proceed.
That link doesn't lead to something useful:

The group I want to remove has the following attributes:
Debugging session of
/2/sharing/list_folder_members

(ABAP language doesn't allow field names starting with a dot, so "DOTTAG" here actually refers to ".tag" which is mapped during the JSON deserialization)
Adding a group to a team folder is pretty much useless without the possibility to remove the group.
I'm afraid to ask for assistance once more 🙂 🙂 🙂
Best regards,
Jan