I have the azure subscription id, how can i find out who is the azure admin ?

Hello Minna Du,

A quick way to see the roles assigned to a user or group in a subscription is to use the Azure role assignments pane.

1. In the Azure portal, select All services from the Azure portal menu.
2. Select Microsoft Entra ID and then select Users or Groups.
3. Click the user or group you want list the role assignments for.
4. Click Azure role assignments. You see a list of roles assigned to the selected user or group at various scopes such as management group, subscription, resource group, or resource. This list includes all role assignments you have permission to read.

To change the subscription, click the Subscriptions list

Please refer to the following document: https://learn.microsoft.com/en-us/azure/role-based-access-control/role-assignments-list-portal