Start here. This is the direct spoken answer to practice first.
Overview
Seeing a model in a catalog does not guarantee that the required version and features are available in an approved region.
I verify the exact model version, API, modalities, tool or schema support, deployment type, region, quota, and account access. I also check dependent services such as retrieval, guardrails, evaluation, or speech in the same allowed geography. Then I deploy a small test endpoint and run application evaluations instead of treating documentation as the final proof.