Sitecore XP deployment can fail with a BadRequest error when creating a Microsoft.Insights/Components/CurrentBillingFeatures resource in Azure subscriptions using only Azure monthly credits for purchases, such as Visual Studio/MSDN Azure subscriptions with spending limit.
This issue can occur due to the fact that Azure monthly credits cannot be used to purchase Application Insights features or consumption. As a result, Application Insights resources are always limited to the Basic pricing plan and 1 GB/month.
In the Azure subscription, set up a payment method such as a credit card and adjust the spending limit prior to deploying Sitecore XP.