When an Approval Process has a step that involves unanimous approval and a Queue is selected as the approver, though many members are added, once any of those user approves the record, it will automatically push through. In this regard, the queue appears to count as one, and is approving it on behalf of the entire queue members.
In order for the Approval Process to work as desired, instead of using Queue, use each individual person/user to be named or included in the approval process.
Example:
User 1 and User 2 should be added instead of adding the Queue where both User A and User B is included
Then unanimous approval would require each individual person to approve before the approval goes through.
This is similar to using a queue as a record owner, although there can be multiple members of the queue, the queue still only counts as one entity, not a group made up by its members.
See Also: Considerations for Setting Approvers
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