Today we released another version of the wizard (2.1.23). We did not publish a fix specifically for your problem but could you try it just in case? If the issue persists, please send a support request to support@plumsail.com. In your message, refer to this topic, provide the last information about the error you get and specify your SharePoint domain.
Hello Daniel! I passed your case to developers but today they have published a new version of the wizard. Could you start it, get the update and check whether the issue persists?
Thank you for the update and sharing the solution, Daniel! Unfortunately, there was an urgent task recently and developers have not had time to look into it. Anyway, I will ask them what could cause the issue.
The property is missing a required prefix/suffix per your organization's Group naming requirements.
It means that you have some restrictions in your tenant for naming the groups and wizard could not handle such an error. We will fix the error message but there is no due date for the task.