How to register an account on GitLab. To prevent spam, new accounts are locked until approved by an admin or the approver bot. You can also file an unlock request to expedite access.
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The only call to createPrivateSubtask() was removed 98 months ago in https://gerrit.wikimedia.org/r/plugins/gitiles/phabricator/extensions/security/+/25c3f70dca558922ac22bb1b664b88208ae2ec37
Bug: T103194
Bug: T87467