Azure Communication Service

Question

Azure Communication Service

Senthilkumar Paranthaman 0

We are trying to use a PowerShell script to send emails using the Azure Communication Service. However, we are encountering a problem with connecting to Azure Communication Services using the connection string, resulting in a 401 unauthorized error. Additionally, we would like to know if there are any other options available to journal the emails sent through the Azure Communication Service.

Alekhya Vaddepally 1,260 Reputation points Microsoft External Staff Moderator

2025-04-24T10:27:58.8833333+00:00

Hi Senthilkumar Paranthaman,
We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution, please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.
Alekhya Vaddepally 1,260 Reputation points Microsoft External Staff Moderator

2025-04-28T09:20:50.6333333+00:00

Hi Senthilkumar Paranthaman, We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution, please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.
Ebraheem Al-Muneyeer (MSFT) 961 Reputation points Microsoft Employee

2025-04-28T14:07:57.05+00:00
Hi @Senthilkumar Paranthaman , I'm sorry to hear that you're experiencing issues while sending emails.

Typically, a 401 error indicates an authentication issue. If you're using the connection string, the problem is likely related to creating the hashing. Do you have a code snippet on how you are sending the email?

For more information on generating the hashing pseudo code, you can refer to the following documentation https://learn.microsoft.com/en-us/rest/api/communication/authentication#access-key-authentication.

Alternatively, you can send the email using the Azure Communication Services CLI Module. For more information you can check the following documentation https://learn.microsoft.com/en-us/cli/azure/communication/email?view=azure-cli-latest. The command will look something like this:

$sender = '' $subject = 'Test email from PS ACS module' $body = 'Hello from ECS' $receiver = '' $connectionString = "" az communication email send --connection-string "$connectionString" --sender "$sender" --subject "$subject" --to "$receiver" --text "$body"

Regarding your second question about journal emails, this feature is currently not supported. However, you can manually write the entire email content, including custom headers, body, To, CC, BCC, etc., and save it yourself.

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Alekhya Vaddepally 1,260 Reputation points Microsoft External Staff Moderator

2025-04-24T10:27:58.8833333+00:00

Hi Senthilkumar Paranthaman,
We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution, please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.
Alekhya Vaddepally 1,260 Reputation points Microsoft External Staff Moderator

2025-04-28T09:20:50.6333333+00:00

Hi Senthilkumar Paranthaman, We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution, please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.
Ebraheem Al-Muneyeer (MSFT) 961 Reputation points Microsoft Employee

2025-04-28T14:07:57.05+00:00

Hi @Senthilkumar Paranthaman , I'm sorry to hear that you're experiencing issues while sending emails.

Typically, a 401 error indicates an authentication issue. If you're using the connection string, the problem is likely related to creating the hashing. Do you have a code snippet on how you are sending the email?

For more information on generating the hashing pseudo code, you can refer to the following documentation https://learn.microsoft.com/en-us/rest/api/communication/authentication#access-key-authentication.

Alternatively, you can send the email using the Azure Communication Services CLI Module. For more information you can check the following documentation https://learn.microsoft.com/en-us/cli/azure/communication/email?view=azure-cli-latest. The command will look something like this:

$sender = '' $subject = 'Test email from PS ACS module' $body = 'Hello from ECS' $receiver = '' $connectionString = "" az communication email send --connection-string "$connectionString" --sender "$sender" --subject "$subject" --to "$receiver" --text "$body"

Regarding your second question about journal emails, this feature is currently not supported. However, you can manually write the entire email content, including custom headers, body, To, CC, BCC, etc., and save it yourself.

Answer 1

Hi Senthilkumar Paranthaman,

The 401 unauthorized error that you are usually viewing means that the Azure is a problem with the authentication credentials used in your PowerShell script to join the Azure Communication Services (ACS).
It may be related to A wrong connection string,A wrong or expiry access key and Set roles for permissions or wrongly resources
Make sure you are using the correct connection string from the Azure portal

Go to your communication service resource in Azure Portal

Under the "Keys and Connection Strings", copy full connection string and make sure it is accurately pasted in your script

If you have recently revived the keys, any script or app using the old key will fail with a 401 error.
Resources should be in an active position and should not be restricted by policies or network access regulations (eg IP restrictions).
You may want to verify that your PowerShell script has been properly structured correctly to call ACS email API. ACS now supports email capabilities via Rest and SDK.

https://learn.microsoft.com/en-us/azure/communication-services/quickstarts/email/send-email?pivots=platform-azportal&tabs=windows%2Cconnection-string%2Csend-email-and-get-status-async%2Csync-client
https://learn.microsoft.com/en-us/azure/communication-services/quickstarts/email/send-email-smtp/send-email-smtp?pivots=smtp-method-smtpclient#prerequisites

if you have any further concerns or queries, please feel free to reach out to us.

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