Thanks Mabel;
Your comment "Please make sure the Excel file on OneDrive for Business is closed", I assume you mean that the Excel Program does not have the OneDrive for Business version of the spreadsheet open? If this is the case, I can say for certain that the excel program is closed while preforming the test.
I feel like this is a permission problem.
About SharePoint, I went to the administrators this morning and they gave me the permissions to create a site collection. The difference here is
The site that works has a URL like this:
https://nameofmycompany.sharepoint.com/sites/MyName/Lists/Lot/AllItems.aspx
The site that does not work as a URL like this:
https://nameofmycompany-my.sharepoint.com/personal/myname_mycompanyname_com/PowerAppsData/Lists/NameTest/AllItems.aspx
The difference above is the -my.sharepoint.com.
Again, this seems like a permission issue.
The million dollar question is how to fix this?
Cheers
Gerry