Slack Usergroup Update Permission
As per Slack Guidelines to update usergroup by third party apps.
**In order to call this method successfully, you’ll need to ensure that your workspace settings allow you to manage user groups; otherwise you will receive a **permission_deniederror.To update this setting, navigate to Tools & settings > Workspace settings > Permissions > User Groups within your workspace and update who can create, disable, or modify user groups from the drop-down menus.If user group permissions cannot be changed and are restricted to admins only, use the user token from a user with the correct permissions. A bot token can be used only if permissions are set to everyone.
