To troubleshoot:
This is observed when nodes can't communicate with each other.
You can Log in to the node-hosted virtual machine (VM). Go to Applications and Services Logs > Integration Runtime, open Event Viewer, and filter the error logs. If you find the error System.ServiceModel.EndpointNotFoundException
or Cannot connect to worker manager
Follow the official documentation with detailed steps for Troubleshooting Error message: Self-hosted integration runtime node/logical self-hosted IR is in Inactive/ "Running (Limited)" state