While Android enrollment - Error in connecting to host, please try again

since 3 weeks we have issue that while android enrollment we receive this message: “Error in connecting to host, please try again”. The enrollment works only if I added my user to a active Sync group.

I try this “solution”: https://support.workspaceone.com/solutions/SOL-3031 but its not work. We checked our DS and firewall and we dont see anything what block connection from device to DS.
Concosle version 1811. Android version from 4.4 - 8.0

Thanks and Regards,