With the official Xbox official account it has been announced that the service is currently experiencing some problems related to store browsing, content purchasing and code redemption.
From a Twitter profile they have announced that they are working on solving the problem and hope that it will be resolved soon. If you enter the store you find these types of problems available and it is not a problem with your connection or your Xbox Live account.
Xbox Store Problems
We know that users have problems purchasing content, coding, and navigating the Microsoft store. Take a look at it and will update you here on our status page as we have more details. https://t.co/dG2dbISiH7
– Xbox Support (@XboxSupport) March 28, 2020
If you want to follow the emergence of Xbox Live issues, we remind you that you can visit status page and official Xbox accounts.