You see mail similar to this, where you are asked to approve the new Install Administrator account that you just created:
Dear MiniCluster Administrator, A new user has been created and is awaiting your action. Please approve or deny registration of user Joe Smith, as Primary Admin by following the link provided: https://compute-node1-hostname/MCMU/admin_approve/mcinstall/749cee7610a4e594ee867b243a22cae537fe77b81b92c4aad33d8befbd8e8611/approve/
For example, using the example output, you would copy this approval link URL string:
https://compute-node1-hostname/MCMU/admin_approve/mcinstall/749cee7610a4e594ee867b243a22cae537fe77b81b92c4aad33d8befbd8e8611/approve/
The approval screen appears.
A screen appears, confirming that the Install Administrator account has been approved.