-The error occurs when the [Dataverse Web API](/power-apps/developer/data-platform/webapi/overview) receives a request with an invalid `odata.include-annotations` value in the `Prefer` request header value. This issue occurs when the request is sent using the `POST`, `PATCH`, `PUT` or `GET` HTTP methods with a `Prefer` request header that contains an invalid or improperly formatted value. For example, the `odata.include-annotations` value incorrectly includes backslashes '`\`' to escape the quote characters.
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