I have a scheduled site workflow and noticed it hasn't run since 4/28/2022. When I went into Central Admin -> Monitoring -> Timer Jobs -> Review job definitions I saw that it was listed. How do I get this job to show back up in the job definitions list?
Sorry to hear you are having this issue.
Please see the following KnowledgeBase article which has the NWAdmin command to add the Nintex Workflow Scheduler job back to your environment.