Hi, I am an Independent Advisor, and welcome to Microsoft Q&A.
I understand you have reset your laptop, and you were not able to activate your Microsoft Office Home 2021.
Have you tried checking the original specifications of your laptop online? Normally that would show if your machine comes with Microsot Office Home 2021.
If you reset your machine before activating Office, you may potentially lose your license if it was a one-time purchase associated with the device. If this is the case, you may need to reach out to ACER after-sales support and explain what happened; you may need to provide proof of purchase.