Can't connect with current Elastic APM

[DaGeRe]

Bug Report

Which version of the demo you are using?

I'm using ec2eeb3 (latest as I cloned).

Symptom

I just wanted to see the basic behavior, so I registered, and:

• In the Elastic cloud: Clicked on "Add Data", "Application", "OpenTelemetry", and got my endpoint and Api Key. The header was something like "Authorization ApiKey XYZ===", so I assumed my key is XYZ===.
• In the .env.override: Changed

ELASTICSEARCH_ENDPOINT="https://my-observability-project-a2475f.apm.us-central1.gcp.elastic.cloud:443"
ELASTICSEARCH_API_KEY="XYZ=="

• Run make start in the demo.

What is the expected behavior?

When I click on 'Check Status', I expect data to appear - but nothing appears.

What do you expect to see?

The OpenTelemetry demo application data displayed in Elastic APM.

What is the actual behavior?

It says "No data has been received from agents yet".

Reproduce

Just register a new account, set the ApiKey and run make start.

Additional Context

Also changing OTEL_COLLECTOR_CONFIG to OTEL_COLLECTOR_CONFIG=./src/otel-collector/otelcol-elastic-otlp-config.yaml (like described in the Managed Ingest Endpoint section) doesn't work.

curl -X GET "https://my-observability-project-a2475f.apm.us-central1.gcp.elastic.cloud:443" -H "Authorization: ApiKey XYZ==" returns {"version":"8.9.0"}, which, I assume, should be fine.