Hello sdelvisco,   You may try a fresh install again.   "while installing OME, target this pre-created database" (your backup) that will allow it to write the permissions. [URL]   Try re-start the OME services and check results.  They are called "DSM Essentials ..."   This was fixed in a previous version but worth a try. Perform an IISRESET at the cmd or Run line which will allow the re-added user to login normally.  
I am migrating our Dell OME from a Windows Server 2008 R2 VM to a Windows Server 2016 VM. The original OME server was set up by a former Systems Administrator that is no longer here. I have no idea what he did to get the original install working. I am just tasked with migrating it to the new operating system. I backed up the OME database with SQL Server Management Studio 18 on the old server, following the documentation I could find online. I installed OME on the new server and tested logging into the blank database - which worked. I restored the database backup on top of the clean OME database according to the white paper from Dell. When I try to login it gives me the error "AccessCheck(): Client logon credentials not authorized." This is a fresh server 2016 Datacenter install and it is not a domain controller. In my DCs I have a security group named "OME" but no groups named like the other forum threads suggest. The user I am attempting to log on as is in that OME security group in my DC. I still cannot log on. Any ideas of what I need to do to get this working? Is there something I must do to point to this restored database as a new install? Is the restored database still "pointed" to the old server install?
OME 2.5 on Server 2016 AccessCheck(): Client logon credentials not authorized