It looks like the '422 Unprocessable Entity' error could be associated with a compatibility issue between Prefect and a particular version of Pydantic (2.5), as mentioned in one of the GitHub issues from the Prefect repository. Users reported that using Pydantic 2.5 with Prefect could lead to errors when trying to build deployments. Here is the relevant part from the GitHub issue: ### Bug summary: The

Prefect deployment build

command is not compatible with Pydantic 2.5 and will error out as soon as you use it. ### Reproduction: 1. Install Prefect + Pydantic 2.5 2. Run

Prefect deployment build ...

3. Verify error occurs ### Error encountered:

python
Script at 'utl_hello.py' encountered an exception: PydanticImportError('`BaseSettings` has been moved to the 
`pydantic-settings` package. See <https://docs.pydantic.dev/2.5/migration/#basesettings-has-moved-to-pydantic-settings> for 
more details.')

### Versions affected: - Prefect Version: 2.14.10 - Python Version: 3.11.6 If you're encountering this error, you may want to either downgrade Pydantic to a compatible version or check for any recent updates or patches from Prefect that might resolve the issue. For your specific case, a '422 Unprocessable Entity' error typically occurs when an HTTP request is well-formed but was unable to be processed due to semantic errors. Checking the payload you are sending, ensuring it complies with the Prefect API expectations and does not contain any invalid or missing fields, would be a good troubleshooting step. If this doesn't resolve the issue, please refer to the Prefect community or GitHub issues for further assistance.