Create Excel workblook option missing

On the Onedrive app on iOS and Android, when connected to a corporate account I do not see an option to create a Excel File, however when connected to my personal account, the option to create an excel file is present. Is there a reason why this is different? Why cant the Excel option be available on the Corporate accounts as well?

Incidentally, even when I open an existing Excel file on the mobile app, it opens as a pdf.

Here are a couple of screenshots that showcase this - 

On Corporate account - 

On Personal Account -  Notice the extra option to create an excel file

Would be great if excel can be enabled when connecting to Corporate / O365 accounts as well.