m4 added a validation to ensure multiple items aren't defined in the swagger's security block. ACR does this, and so generation will fail if the generator is using the latest version fo m4.

We'll need to update the swagger to prevent this issue in C#, which is using the latest verion of m4, and to prevent the issue from happening in other languages when they upgrade.

Details of change can be found in this transform: Azure/azure-sdk-for-net#20833

We will make the change directly to the swagger.

After the swagger is updated, the transform in azure-sdk-for-net must be removed.