SAP BTP | Neo Environment | Unable to add /edit members in my subaccount

Hello All,

I have a sub-account in my SAP BTP Account which is in Neo Environment. I wants Admin roles in order to add member to sub-account. But I am unable to add new members(Disabled/ only can view the members) in to my sub-account as my Role is not Admin.

How do I change my role in the sub-account to Admin ?

It shows the below message while trying to add member :

Any help is much appreciated!

Thanks!

Siji Thomas