Finding and understanding the Workspace log files can help troubleshooting errors.
The log files for Workspace 365 are accessible by going to the Instance Operator Panel.
There you'll find the option "View log files".

The logs are sorted on date and time and are categorized in "General" and "Error".

Logs are created in this formats:

• Date
  • Hour
    • Type of log *Usually error.log is the only relevant log

 Example from error.log:

2018-09-07 14:00:43.485 ERROR [141] demo uid5  NDAW.Core.SharePoint.SharePointTeamSite - Can't retrieve the web id / sitecollection id from team site `https://w365teleworm.sharepoint.com` 
 NDAW.Core.SharePoint.SharePointTeamSite.ShouldRootWebBeIncluded(:0) (null) 
 Microsoft.SharePoint.Client.ServerUnauthorizedAccessException: Toegang geweigerd. U bent niet gemachtigd om deze bewerking uit te voeren of deze bron te openen.
   at Microsoft.SharePoint.Client.ClientRequest.ProcessResponseStream(Stream responseStream)
   at Microsoft.SharePoint.Client.ClientRequest.ProcessResponse()
   at NDAW.Core.SharePoint.SharePointTeamSite.ShouldRootWebBeIncluded(ISiteStructureLoadingStrategy loadingStrategy)

The logs are build up starting with the date and time where the error persists:

2018-09-07 14:00:43.485

The next important part is the environment name and uid(userid):

demo uid5 

Mostly the first three lines is only readable for the admin. The rest should be processed by our Support.

- Can't retrieve the web id / sitecollection id from team site `https://w365teleworm.sharepoint.com` 
 NDAW.Core.SharePoint.SharePointTeamSite.ShouldRootWebBeIncluded(:0) (null) 
 Microsoft.SharePoint.Client.ServerUnauthorizedAccessException: Toegang geweigerd. U bent niet gemachtigd om deze bewerking uit te voeren of deze bron te openen.

In this part you can see that Workspace can't retrieve child info from the sharepoint root site. The actual error is that Access is denied.

If our support department asks for delivery of logs files, please include everything(the whole stacktrace). You can also download the log file as a zip.

The download button is on the top-right.