Error with Missing "Identifier" Annotation in JSON Schema Generation

It's not clear what I need to annotate, and how. I'm encountering this error a lot:

at path: ["..."]
details: Generating a JSON Schema for this schema requires an "identifier" annotation
schema (Suspend): <suspended schema>`

at path: ["..."]
details: Generating a JSON Schema for this schema requires an "identifier" annotation
schema (Suspend): <suspended schema>`