During login to office 365 you face this error message:
AADSTS50107: The requested federation realm object ‘https://ucs-sso.domain.de//simplesamlphp/saml2/idp/metadata.php’ does not exist.
The error on the MS login page is usually an indicator that the Powershell script the wizard generates has not been executed successfully on a Windows PC
You can check the Federation settings via powershell.
It should show the azure DNS domain as federated:
Connect-MsolService Get-MsolDomain Get-MsolDomainFederationSettings -DomanName <azure-dnsdomain>
If the the domain is not shown as federated, open the batch script created by the UMC Office365 Setup wizard and execute each command manually in a powershell session.
If it shown as federated, but you get this error anyway, you can also execute each command manually in a powershell session. After that clear your browser cache.
If the powershell script failes make sure inn Azure Active Directory admin center beneath Custom domain names the domains show up as verified and the UCS domain not as primary.