How to fix error "Required environment variable not found: AZ_LS_CERT_THUMBPRINT."

Question

How to fix error "Required environment variable not found: AZ_LS_CERT_THUMBPRINT."

I am using Azure platform the maching learning service. In the designer tab, I created a pipeline and then submit and configure. However, everytime I have the error listed as "Failed to execute command group with error An unexpected error occurred while executing command due to: Required environment variable not found: AZ_LS_CERT_THUMBPRINT. (inner_err: None)".

My compute instance is created and running, but I haven’t been able to identify why this environment variable is missing or how to set it correctly. Could you please advise on the steps needed to resolve this error so the pipeline can run successfully?

Andi Wang0Reputation points
2025-04-22T05:57:39.67+00:00
It happened to me as well - the problem started 4/20/2025, while all pipelines worked alright until 4/19/2025. I attempted to change workspace, change subscription, and even change Azure account. The problem persists.

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Andi Wang0Reputation points
2025-04-22T05:57:39.67+00:00
It happened to me as well - the problem started 4/20/2025, while all pipelines worked alright until 4/19/2025. I attempted to change workspace, change subscription, and even change Azure account. The problem persists.

Answer 1

Hi there Sophie

Thanks for using QandA platform

Guess the compute environment is missing a needed variable for secure certificate-based communication — specifically AZ_LS_CERT_THUMBPRINT.

Go to your pipeline job settings and check the environment configuration.
If you’re using a custom Docker image or environment, make sure this variable is defined in your environment or passed during job setup.
You can manually set it by going to the Environment variables section in your compute configuration or pipeline step and adding: AZ_LS_CERT_THUMBPRINT=<your_thumbprint_here>

Also try recreating the compute or using a default Azure ML environment to see if that resolves it.

If this helps kindly accept the answer thanks much.

kothapally Snigdha 2,185Reputation pointsMicrosoft External Staff
2025-04-21T05:35:13.1133333+00:00
Hi Sophie
Following up to see if the above suggestion was helpful. And, if you have any further queries do let me know.
kothapally Snigdha 2,185Reputation pointsMicrosoft External Staff
2025-04-22T03:56:31.27+00:00
Hi Sophie
Following up to see if the above answer was helpful. If this answers your query, do click Accept Answer and Yes for was this answer helpful. And, if you have any further query do let us know.
Sophie30Reputation points
2025-04-22T15:51:18.3+00:00
Thanks, Azar, for your response. I retried it today, and it’s actually working successfully now. Not sure what the issue was, as I didn’t change any settings.
Azar27,670Reputation pointsMVP
2025-04-22T17:44:13.0766667+00:00
Great to know Sophie
Thnx for letting us know.
Dont forget to accept the answer to close this thread.

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How to fix error "Required environment variable not found: AZ_LS_CERT_THUMBPRINT."

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