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Application Insights: TelemetryChannel found a telemetry item without an InstrumentationKey.

When reviewing some log messages inside Application Insights I noticed a lot of messages like this:

AI: TelemetryChannel found a telemetry item without an InstrumentationKey. This is a required field and must be set in either your config file or at application startup.

I had an ApplicationInsights section inside my appsettings.json where I provided an instrumentation key, so that could not be the issue(and the trace message arrived in the correct Application Insights resource).

This turned out to be a bug in the Application Insights version I was using(2.15.0).

Upgrading to the latest version(2.20.0 at the moment of writing) solved the problem.

Up to the next issue!

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