You can recover from the Principal user@MYDOM.EXAMPLE.COM not found error
This error can occur if the GCD does not have a directory configuration for the MYDOM.EXAMPLE.COM Active Directory. In Administration Console for Content Platform Engine, select the name of the FileNet® P8 domain and then click Directory Configuration.
This error can also happen in a multi-domain environment if the GCD does not have the directory configuration for a client domain set up, as each client domain must individually have its directory configuration set up.