Hi @Holencik, Paul,
Thank you for posting in this community.
I know it seems simple, but please confirm that the URL you entered is correct and follows the proper format. Example: https://contoso.sharepoint.com/teams/SiteTitle
Make sure you use https and not http.
I suggest you do another migration to see if the problem persists. If the problem still exists, please share a screenshot of what went wrong with it, it might help me analyze the problem better. Also, I would be interested to know if the URL in question is for SharePoint 2010 or SharePoint Online. Please be careful not to give out your private information.
Thank you for your time and efforts in advance.
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