Failed with code 503: 'Service Unavailable' at /v2/jobs/activation

So we’re using 8.8 and receive the following error in our Spring Boot application when using the Camunda Client:

io.camunda.client.job.poller             : Failed to activate jobs for worker calculateCandidateUsersJobWorker#calculateCandidateUsers and job type CalculateCandidateUsersio.camunda.client.api.command.ProblemException: Failed with code 503: ‘Service Unavailable’. Details: ‘class ProblemDetail {type: about:blanktitle: Service Unavailablestatus: 503detail: nullinstance: /v2/jobs/activation}’

Closing as duplicate of: Camunda Spring Client: Failed with code 503: 'Service Unavailable'