62435/how-to-add-co-admin-to-an-azure-subscription
To assign a user as an administrator
Sign in to the Azure portal as the subscription owner and open Subscriptions.
Click the subscription where you want to grant access.
Click Access control (IAM).
Click the Role assignments tab to view all the role assignments for this subscription.
Click Add > Add role assignment to open the Add role assignment pane.
If you don't have permissions to assign roles, the option will be disabled.
In the Role drop-down list, select the Owner role.
In the Select list, select a user. If you don't see the user in the list, you can type in the Select box to search the directory for display names and email addresses.
Click Save to assign the role.
After a few moments, the user is assigned the Owner role at the subscription scope.
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