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Custom Metadata Type records cannot be created or updated through REST and SOAP APIs. CMT records are metadata and must be manipulated using the Metadata API.
https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_Metadata_Operations.htm#apex_class_Metadata_Operations
https://andyinthecloud.com/2017/08/29/introducing-custom-metadata-services/
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