The solution may not be that easy to find as it may be an issue that Adagio doesn't see Excel installed for you resulting in a CSV output rather than a XLSX output.

What O/S is on your workstations and server?

Are you using a Terminal server (RDS connection)?

How did you update office? New computer with new version, or updated the old version in place, or ...?

What flavor of Office? There are 4 or 5 different versions of Office 365 or I’m sure there are other flavors that are not even coming to mind.