A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Are you using Office 2021 considering you bought it in 2023?
What about your macOS? Is it one of the most recent 3 versions?
If so, Please uninstall your Office apps. To uninstall, you move all Office apps, like Word, Excel, PowerPoint, Outlook, Teams to trash bin.
Please use the instruction here: https://support.microsoft.com/office/how-to-remove-office-license-files-on-a-mac-b032c0f6-a431-4dad-83a9-6b727c03b193 Download and run the license removal tool to clear any old cached license.
Then download the latest version from the link below, and then make sure you sign into the correct account.
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If you are not using the most recent 3 OS versions, please provide OS version because the above instructions need to be adjusted.