Microsoft gives a of Microsoft 365 Family. You get a real product key during signup. What you need: A credit card (to prevent abuse — cancel before 30 days to avoid charges).
These are not Office 365, but they give you permanent access to core apps. microsoft office 365 product key activation free
If you're looking for free alternatives to Office 365, consider the following options: Microsoft gives a of Microsoft 365 Family
Microsoft Office 365 is a subscription-based service, meaning you pay monthly or yearly for access. Any website, video, or tool promising a "free product key" is likely distributing stolen, cracked, or fake keys — which can expose you to malware, identity theft, or legal liability. or legal liability. Microsoft offers free
Microsoft offers free, browser-based versions of Word, Excel, PowerPoint, and OneNote.