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More information is needed. There are so many cloud systems, & their method is also various,. What cloud/ what environment etc. are required.
Every cloud systems have a mechanism to unlock forgotten password. Either by saying the words like Forget Password or something like that. Or there is a Help button to overcome this issue. First you have to try to reset your password by providing some information which you supplied earlier at the time of crating cloud account.
Or invoke the vendor's official website & try to get help.