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This is Tim with Microsoft Office 365 SharePoint Support.
I am able to browse to the domain that you have listed. When you click on the "Change Address" option, do you see http://<domain>.sharepoint.com or http://www.ernsglass.com listed by it? I will continue to monitor this thread and wait for your reply.
Microsoft Office 365 SharePoint Support
I understand after migration, you want to change your SharePoint website address to use your own domain.
In your situation, are you still facing this problem? If so, I'd like to clarify whether you can access your SharePoint website with contoso.sharepoint.com address. Also, I'd like to know which website browser are you using?
For troubleshooting this issue, I'd like if you could sign out MOP (Microsoft Online Portal) and sign in again and then try to change your website address in MOP.
If the problem still persists, I'd like if you could try to log into MOP use another website browser (For example: Firefox) , or you may clean the cookies of your browser and then try to change the website address again.
To clean the cookies in IE:
Open your IE browser, Click the Tools button , point to Safety, and then click Delete browsing history. Select Temporary Internet Files and Cookies, uncheck Preserve Favorites website data check box if you had added the onmicrosoft.com domain as favorite, click Delete.
Meanwhile, any capture of the error screen would be appreciate.
For more information, you may refer to the following:
Use a custom domain name for your SharePoint Online public-facing website address
it was good old AOL issues, got out of it, went to Internet Explorer and proceeded as you described.
thanks for your help