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The HTTP method is not supported for this path.
405 application/problem+json
Every PermitCore error is RFC 9457 application/problem+json. Branch on type (a stable URI), not on title or detail (human-readable, may change).

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When it occurs

You used an HTTP verb the endpoint does not implement (e.g. DELETE on a read-only listing route).

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How to fix

Use the documented method for the endpoint (see the API reference). Not retryable unchanged. Not retryable — fix the request before resubmitting; retrying unchanged returns the same error. See the full error catalog for the response shape and retry matrix. Every response carries an x-request-id header — include it in any support request.