Hello Arpan Mehetre,
Welcome to microsoft Q&A , Thankyou for posting your query here.
Verify if there are any ongoing issues with Azure services, especially in the South Central US region where you deploy your ACIs.
Azure Service Health will provide updates on outages or other issues that might be affecting container services.
Ensure that you haven't hit any limits or quotas that could be affecting the deployment of new containers like number of ACIs, CPU, memory resources, and network resources in your subscription.
For instance, Check that your ACIs aren't waiting on any external resources that aren't available.
check if there were any changes to your Azure environment, application code, or related dependencies around that time.
If an answer has been helpful, please consider accepting the answer to help increase visibility of this question for other members of the Microsoft Q&A community. If not, please let us know what is still needed in the comments so the question can be answered. Thank you for helping to improve Microsoft Q&A!