These days the strength of a password is important. At times the same username and password is not accepted. Likewise, certain keys (characters) in the keyboard is not accepted. This could be the problem in your case. Try a combination lowercase, uppercase and numbers. Also note that these days it is important to have a minimum number or characters (say 6 or 8) is mandatory. So if you are trying with 4 or 5 characters, that password will not be accepted. Please note that passwords are case sensitive, and write down the password immediately in the exact order you typed it in.

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