The Sources client authentication key was correct and hmac signature procedure was also correct.
Cause:-
payload length mismatch calculation while creating signature,
Issue resolved by fixing client code
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following below document
https://learn.microsoft.com/en-us/azure/azure-monitor/platform/data-collector-api?WT.mc_id=Portal-Microsoft_Azure_Support#authorization
shared key generated using document provided c# code
always getting below error
The Sources client authentication key was correct and hmac signature procedure was also correct.
Cause:-
payload length mismatch calculation while creating signature,
Issue resolved by fixing client code