Indeed a service issue.
Impact Statement: Starting at approximately 16:00 UTC on 01 October 2024, you have been identified as part of a subset of customers across multiple regions using the Azure OpenAI service who are experiencing some errors while making calls to the GPT-4o 2024-08-06 model.
Impacted regions: East US, East US 2, West US, North Central US, South Central US, West US 3 and Canda Central
Current Status: We are investigating and are actively working to find out the potential cause of this service event while also assessing an effective mitigation strategy. The next update will be provided within 2 hours, or as events warrant.