Sage tab not showing in Excel

SUGGESTED

We have a new PC with a fresh installation of Sage 50 Accounts and Microsoft Office 365. However, the Sage tab is not showing in Excel. I have tried adding it in Excel via File, Options, Add-Ins, Manage, COM, Go, but the Sage add in is not present. How can I get this working? Sage otherwise works fine on this PC.

A colleague has tried installing the driver but a message says it is already there.

Thank you.