There may be a couple of reasons why your login credentials are not being accepted by Moodle:
1) You are using the incorrect CSU email username and/or password
Solution: Check your CSU email username and password to make sure you are entering the correct combination of letters and/or numbers.
2) Your CSU email password needs to be reset
Solution: Call the ITD helpdesk at 773-995-3963. Inform them that your CSU email password needs to be reset. They will provide you with assistance in claiming your account online.