In AI Services 10.4, the configuration for .errands.ollama_models has changed.
For versions prior to 10.4:
handle: gpt-oss:20b
In 10.4, this has been renamed:
name: gpt-oss:20b
AI Services/GenAI tile 10.4
This changed was made to take advantage of Ops Manager's Logical Key feature for collections:
You will need to update your pipeline/automation for GenAI to use the value name instead of handle.