Hi, I'm John! I will help you with this.
If you haven't already, I’d suggest is to uninstall any existing Office apps on your Mac to avoid conflict: https://support.microsoft.com/office/uninstall-office-for-mac-eefa1199-5b58-43af-8a3d-b73dc1a8cae3
Then, to reinstall Microsoft 365:
- Go to https://m365.cloud.microsoft/apps
- If you're not already signed in, select Sign in and use the account linked to your Office or Microsoft 365 purchase.
- Once signed in, from the Apps tab, select Install Office to start the download.
For complete steps and how to install please visit: https://support.microsoft.com/en-us/office/download-install-or-reinstall-microsoft-365-or-office-2024-on-a-pc-or-mac-4414eaaf-0478-48be-9c42-23adc4716658#installsteps=install_on_a_mac
I really hope this information is helpful! :)
Let me know how it goes or if you have any further questions or concerns.