I'm not sure what you mean. My description is of an admin user issue, not a bug, and therefore must be rectified by amending user behaviour. That is to say, make sure you enter the SEP Domain (not Windows Domain) into the domain field at SEPM Console log in, or don't enter one at all.
This does all assume that you are entering the username for a SEP Admin account that doesn't exist in the SEP Domain you're naming though, and while this is the most common reason I've seen for the issue you've described, you've not yet provided enough information to confirm or refute that assumption.
Feel free to ping us more details, if you need further assistance.