Hi @Laxmi2024 ,

Did you pass the subscription key as a header parameter in your message ? please share screenshot of code which you tried. 

i hope this helps..

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I did try the attached. and here is the error.

which tool  ? APIM

can you brief which tool your trying , APIM ?...

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Yes, its APIM, I am talking to Third party system via APIM from servicenow, so servicenow calls API's in APIM , Azure,and the Azure APIM Api's are configured with third party API calls.

I don't find anything on internet called APIM ? Can you abbreviate APIM ?

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