We just installed PSA v3 and I (as system administrator) am doing the initial configuration, following this series (Part 1-6): Dynamics 365 Project Service Automation - PSA's Basic Settings, Part 1
I am unable to define/access Resources in our system. Viewing 'Resources' in the Project Service, I see only the 'Generic Resource'. There is no [+ New] option for adding our Users as resources. When I view the 'Generic Resource' the banner at the top says 'Read-only: You don't have access to edit Bookable Resources'.

I am a system administrator. Would think that is enough, but I also gave myself the following roles:
- Project Approver
- Project Billing Administrator
- Project Manager
- Resource Manager
I have ensured the licensed users in our system have the following roles (among others):
- Project Resource
Is there something I am missing, or somewhere else I need to go to define our users as resources in our system? We just upgraded to PSA v3 yesterday. (old version of PSA was installed but not actively used).
We do not use Field Service, but have an old version installed (7.5.4.51), with status 'Upgrade available'. Upgrading PSA was a bit tricky in our system, so I don't want to mess with upgrading Field Service right now unless that is blocking us from using PSA v3.