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You can access the MS Office365 login page through the www.portal.office.com. Type your user name and then click on the link named Can’t access your account?

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In below screen, click on the Work or school account link.

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Then give your user id (pgim email ) and proceed. 
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Click on the contact an administrator link to make a password reset request.

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Wait till you get the reset message form University of Colombo( It takes nearly one day)