First ensure that you are signing into the correct server. D4H has servers around the world and you may be trying to log in to an incorrect URL.
Every team has its own web address to sign in with. You should find yours and bookmark it. If you are unable to remember your team URL there is a generic login page that can assist you with accessing your account.
Remember, even though you are physically located in one of these regions, your team account may not be on the local server.
Personnel & Training, Equipment Management and Incident Reporting Server URLs: