Inspiron 5490, Microsoft Office 2019, activation issues

I recently bought Inspiron 5490 which comes with Microsoft Office Student and Home Edition 2019. Yet, it's still showing me the following whenever I open any of its applications:

"Powerpoint hasn't been activated. To keep using PowerPoint without interruption, activate before 27th October 2020."

I don't know what to do. Kindly help me out