Resubmit a Task
You can resubmit a process task that has been rejected but can't be deleted, cleared, or hidden.
Tasks confirm that an outcome has been achieved to a related action. Tasks are not designed to complete only if a specific outcome is recorded. Instead, tasks confirm that an action was taken. So, even if a task was rejected, that rejection is still seen as action having been taken. Thus, the majority of the time, a user needs to resubmit a task so that it triggers the process again.
To trigger the process that resubmits a task, a SPoC needs to identify the process that created the task and the related dependent fields and conditions.
Once you do so and resubmit the task, the Rejected status disappears, and the task can be completed.