406 browser integrity check?

Only started happening today but a page (looks fine when I go to it) is now showing a 406 error to an external API (been using it for ages). The API is sitting in Google Cloud Run. I see some entries in the Security events list from today with Action Taken - Block - is this likely to be my issue

Hey there,

Error 406 happen when resource is not available at the origin that adheres to negotiation headers that were set prior (e.g. via Accept-Charset and Accept-Language headers)

This status code can be replaced by simply serving the less preferred method to the User-Agent in lieu of generating this error.

Thanks

Jim

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