The managed ingest instructions:
https://github.com/elastic/opentelemetry-demo?tab=readme-ov-file#managed-ingest-endpoint
Advises
YOUR_OTEL_EXPORTER_OTLP_TOKEN: your Elastic OTLP endpoint token. This is what comes after ApiKey=.
This should read:
YOUR_OTEL_EXPORTER_OTLP_TOKEN: your Elastic OTLP endpoint token. This is what comes after Authorization=.