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Dear Burri Fabienne HSLU DFK,
Thank you for the information and the screenshots that you provided.
As your MacOS version is Monterey 12.7.2. I would like to convey that macOS Monterey supports the latest Office apps on the Mac and here is the official reference: Upgrade macOS to continue receiving Microsoft 365 and Office for Mac updates - Microsoft Support
In this situation, I would like to suggest you follow the below steps and see whether you are able to download and install the latest version of Office apps on your macOS:
Step 1: Open the Finder> Applications> Right-click on each Office app> Move to trash.
Step 2: Click Command + Shift + G> Enter ~/Library/Containers> Move Microsoft Word, Microsoft Excel, Microsoft PowerPoint, and Microsoft OneNote to the desktop location> Restart your Mac.
After following the above steps, now download the 16.79 Office apps from this referenced article: Update history for Office for Mac - Office release notes | Microsoft Learn
Once the download of 16.88 Office apps is successful, please install the downloaded apps and sign in with your Office 365 account.
P.S.: Please remember to disable "Office Update Automatically".
Click Help in the menu> Check for Updates, uncheck the option "Automatically keep Microsoft Apps up to date".
I appreciate your cooperation and valuable time.