I am using the following method:
POST: /wiki/rest/api/group/user?name="Group Name"
I entered a JSON list with multiple account IDs in the following format:
That REST API end-point does not support adding multiple users in one go. If you add multiple "accountId" properties, only one of them will be processed.
Simply, instead of trying to bulk-add 3 users in one call, add one in one call and make 3 calls altogether.
(According to the REST API does, "bulk-add" isn't supported by alternative end-points, either.)
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