Save option grayed out when 'On my Mac' selected
On a MacBook Pro macOS Sierra version 10.12.5, I am attempting to save a Microsoft Excel (version 15.36) spreadsheet in a csv format. When I select the 'On my Mac' option, save is grayed out:
If I switch to 'Online locations' the option to save is available:
How do I enable the ability to save a file locally? I am new to this OS, so any assistance would be greatly appreciated. Thank you!
MacBook Pro TouchBar and Touch ID, mcOS Sierra 10.12.5