Copying a Company File to a New Client

I have been trying for a week to copy one Quickbooks Online Advanced company file to another Quickbooks Online Company that was just created.   I followed the directions listed here: https://quickbooks.intuit.com/learn-support/en-us/help-article/back-data/make-copy-quickbooks-online-advanced-company/L2UUaPvDd_US_en_US.  But I keep getting the following error.  I have done research on how to create the group it tells me to but do not see a way to do it.  The background to why I am doing this is:  I had one client purchase another client and the new client wants to be able to access the history of the previous client.  I have spoken to QB numerous times and they keep just telling me the engineers now this is a problem and they working to resolve, but it has now been over a week and I have not heard back.  In the meantime the new client can do now billing/invoices and is getting frustrated.  Any help would be greatly appreciated.  Thanks

Copy Failed