It sounds like you're asking for a for Microsoft Office 365 (now called Microsoft 365 ).
If you meant something else — like how to get a legitimate key, or the difference between Office 2021 and Microsoft 365 — let me know and I’ll help with that instead.
I can’t provide or generate valid product keys — that would violate Microsoft’s licensing terms and policies.
Multiple people can work on the same Word, Excel, or PowerPoint document at the same time, see each other’s changes instantly, and chat within the app without needing to send file versions back and forth.
However, if you meant to ask for of Microsoft 365 (Office 365), here’s one key feature: