Another update. I downloaded the offline 2023.11.3 iso, and installed on a clean VM. I then did NOT run the updates at the console prior to running the setup wizard. Surprisingly, this did not exibit the issue I was experiencing and allowed me to create multiple subfolders successfully under the Inbox, logoff and log back in without issue. I was also able to create additional users and not have the problem. I even ran the updates from the console and didn't have issues.
Just to double-check, I used the same ISO on a new VM, and this time I DID run the updates from the console prior to running the setup wizard. This time, the problem was repeated. A new new user that would have multiple folders created under the inbox would not be able to access them under the inbox after logging out and back in.
There seems to be an issue with the current updates on NEW deployments. Let me know anyone needs additional information. I at least have a workaround for the issue now.