Transition from Azure classic administrator roles to RBAC roles

There was an email from the Azure portal, asking us to transition from Azure classic administrator roles to RBAC roles for one of our subscriptions. 

As mentioned in this documentation,

https://learn.microsoft.com/en-us/azure/role-based-access-control/classic-administrators#prepare-for-co-administrators-retirement

https://learn.microsoft.com/en-us/azure/role-based-access-control/role-assignments-portal-subscription-admin

I have added the co-administrators and the service administrators as seen in the classic administrator pane to "Owner" role for each of the subscriptions.