I created a new azure account, created a subscription and added a vm + DB to it. I also created a DevOps organization and I am trying to add same subscription to DevOps org billing. But not sure why I am getting an error?
Please note: the subscription is active
see details of the subscription type
Please note to check the type of your subscription and make sure it's not a free subscription.
Q: What types of Azure subscriptions can I use to buy Azure DevOps?
A: Almost all Azure subscriptions. We support Azure subscriptions connected to your Enterprise Agreement (EA), Azure subscriptions set up by Cloud Solution Providers (CSPs), through Microsoft Open License resellers, and Pay-As-You-Go. You can also buy using Azure subscriptions that Visual Studio subscribers set up as a subscriber benefit. (But no, your monthly credit can't be used pay for more Visual Studio subscriptions.) The only notable exclusion is that you can't use the Azure free trial, Government, or National clouds.
Besides, if you have used a paid sub, please report your issue to Developer Community.