Error creating plugin: Resource not found

Tue, 20 Jun 2023 09:09:04 GMT 404 POST /backend-api/aip/p

Error creating plugin: {“message”:“Resource not found”}

My wellknown & openapi yaml exist & are accessible from external (tested). What is this error and what do I need to do?

found my issue, my file was under .wellknown/ instead of .well-known/