Startups: Companies that are in their initial stages of business and typically developing a business model and seeking financing.
Hey there, KIM Nguyen
Normally, the credits are assigned to the subscription. As you have got one subscription already, this would mean the credits are assigned to that subscription. When you join the Azure Startups program, you get $1,000 credits straight away. When looking at the available documentation, this looks to have been created under an Azure trial subscription.
To confirm this, please can you click onto the Azure subscription 1 through the your activity page. This should load the subscription details on the portal. Please look for subscription offer on the table.
My image above shows Azure for Students because this is my offer for that subscription. Yours should say free trial.
If you do see this, then the Azure credits are assigned to that subscription as these come with the free trial subscription for Azure. This means you can use them straight away.
For more information on how to get started, please see this article here: https://learn.microsoft.com/en-us/startups/microsoft-for-startups/getting-started-mfs
Hope this helps,
Nathan