Hi Brenner,
Does the issue also occur on the other PCs?
Also do you mean that you encounter the specific error message when you manually add the account in Outlook?
This issue could happen when the HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders registry key does not contain all of the required data. Specifically, these problems occur if the AppData string value is missing from this registry key.
To solve the issue, please try the resolution provided in Outlook: Unable to perform a Check Name or connect to an Exchange mailbox and check to see if the issue can be resolved.