Microsoft project management software used to plan, manage, and communicate a project schedule and other information among workgroup members, project managers, and other stakeholders.
Dear @Suriana Salleh,
I understand that you are experiencing an issue reinstalling and activating Microsoft Project 2016.
Based on the information you provided, you still have the 25-character product key, but you no longer have access to the account that was originally used to redeem it. Unfortunately, Project 2016 must be reinstalled using the account that is associated with the license. In this situation, it could be a Microsoft account (personal account).
If you no longer have access to your account, have forgotten your password, your MFA method is not working, and no alternative verification method is available, please contact Microsoft Support directly. You can find the appropriate support phone number here: Customer service phone numbers - Microsoft Support for personal account support.
Please note that this is a user-to-user support forum. Only Microsoft Support has the necessary tools to verify account ownership, revoke existing authentication methods, and assist with account recovery.
Once your identity has been verified, the Microsoft Support team can help restore access to your account. After regaining access, you should be able to download, reinstall, and activate Microsoft Project 2016 using the associated account.
Please let me know if you have any updates or additional questions. I will be happy to assist further.