In some scenario's we receive tickets where the access has to be provided for bulk user's.
Step 1: Navigate to Group option in confluence
Step 2: Search for the group for which the user's has to be added.
Step 3: Click on Add members tab
Step 4: Add the member by providing their NT user ID seperated by Comma(,) between user's ID
Step 5: By this way, we can add bulk users to any group in confluence.
Note: Add members by NT user ID and not with User name or Email address.