Our azure was billed in GBP, and recently we found there's an item charge quite different fromt he price listed on Azure pricing page.

Contacted the billing team, and been told it's due to the FX rate difference.

For a Auguest 2024 invoice, Microsoft is using April 2023 FX rate.

I know... It doesn't sound make sense at all. But it's what the Microsoft billing support told me.