You are right!
I've tried to install and integrate USS (without Catalog) in existing environment that I use.
A lot of discrepancy were there.
First of all, I use EEM that is connected to MS AD LDAP. There is OpenSpaceAdminGroup in AD and CASMAdmin user is in group. Due installation i've received errors that user CASMAdmin can't be added in OpenSpaceAdminGroup.
I've repeated installation several times with no success.
After that I've raised new environment from scratch. Installation without AD Ldap passed fine, without any errors. Catalog and integration also. Later I add LDAP, and add OpenSpaceAdminGroup from AD to Admin Role in USS. Now everything working fine!
Thank you Raghu!