Hello Singh,
Thank you for posting question on Microsoft Windows Forum!
Based on your query of updating Windows 11 Home to Windows 11 Pro. Well! You can upgrade Windows 11 Home to Pro directly through the Microsoft Store or by entering a valid Windows 11 Pro product key. The upgrade costs around $99–$129 USD depending on the region, and your files, apps, and settings will remain intact during the process.
To upgrade via Microsoft Store. You can open Settings → System → Activation. Select Upgrade your edition of Windows. The Microsoft Store will open to the Windows 11 Pro upgrade page. Purchase the upgrade. Restart your PC after installation. To upgrade using a product key, on the other hand, you can go to Settings → System → Activation. Click Change product key. Enter your 25-character Windows 11 Pro key. Follow prompts and restart.
Since your organization requires domain join, upgrading via the Microsoft Store is advisable and most straightforward option. Back up your files first, purchase the upgrade, and you will be ready to connect your laptops to the company domain without losing data.
You can consult below article for more information regarding your concern.
Hope the above information is helpful! If it is. Free feel to hit "Accepted" for benefitting others in community having the same query too.