This looks like a common Kubernetes connectivity issue where Connectors can’t reach the Zeebe gateway service. I found the following relevant resources:
- Camunda 8 Kubernetes Quick Install Guide
- Connectors Configuration Documentation
- Camunda 8.8 Helm Chart Parameters
- Forum Discussion: Connector to Zeebe-Gateway Connection Issues
- Forum Discussion: Camunda 8.8 Connectors Authentication Error
Does this help? If not, can anyone from the community jump in? 
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