Prices for all cloud services are going up April 1. For some products, you can have price protection depending on your contract. For an EA, SCE or EAS, that's 3 years from the start date. For most CSP products, it's 1 month (if you chose monthly subscriptions) or one year (if you chose annual subscriptions).
That price protection applies only to "plans," such as M365 F1 or E3 or EMS E3. For services that charge based on usage, the protection does not apply. Nor is there a price noted for those in your contract. Think of storage, network and compute costs. There are a lot of services in Azure that are charged based on usage.
A commitment is often issued for that usage. This involves the customer agreeing with Microsoft to spend a certain amount on these types of usage costs. Usually over a period of 3 years. In return, the customer gets a discount on the usage fee. But that discount is always calculated on the current price for a service. The price itself is not fixed.
Normally not such a problem, because price changes in Azure services are usually quite limited. Now suddenly the prices for those services all become 11% higher. That has never happened before!
Say a particular service costs €1 per unit. And you got a 10% discount. So then you pay €0.90. With the price increase, that service suddenly costs € 1.11 per unit. Then you get a 10% discount on that and you pay € 1 per unit. So with that, your negotiated discount has suddenly disappeared because of a price increase by Microsoft.
So customers are going to pay more for these types of services because of the price increase, even if they have agreed to a commitment. You can't actually avoid the price increase for these services. Just like that, usage becomes 11% more expensive.