Question: Where is the URL for the excel add-in stored on a user's machine?

There is a knowledge base article detailing where the URLs are stored. (KB0010872)

https://onestreamsoftware.service-now.com/sp?id=kb_article&sys_id=591346c31bf0085060122026ec4bcb47

For ease of reference, the list of excel URLs will be found in the LogonURLs.txt within the following folder:

 C:\Users\%USERNAME%\AppData\Roaming\OneStream\Common\Settings

Source:  Office hours 2020-07-02