A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Hello @Tom Michael Jack Downes,
Thank you for reaching out to the Q&A forum!
After carefully reading your description, I see that this is quite an unusual situation. However, I will do my best to work together with you to identify the root cause and solution.
To assist you better, could you please provide a bit more information?
1.Could you please send me a screenshot of the exact #NAME / #NAVN error you are seeing, and also a screenshot of the formula you typed?
2.When you type =SUM, does Excel show the formula suggestion dropdown underneath, or does nothing appear?
3.Could you go to File => Options => Language and send a screenshot of both Office Display Language and Office Authoring Language?
4.As you mentioned, could you confirm whether you are using an education (EDU) account provided by your institution?
5.Do you experience the same issue when using Excel for the Web?
I hope you understand that although I am limited by the testing environment available on this forum, I will try my best to troubleshoot this with you. I will wait for your reply and then continue researching based on the information you provide.
Looking forward to hearing from you!
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.