The source SharePoint 2013 farm and SharePoint 2016 target farm are created with different accounts.
The command Mount-SPContentDatabase runs without errors. In the Administration Center in the "Upgrade and Migration" section, the status of upgrade is successful.
But when you try to go to the web application address, it asks for a login-password three times, and then just shows a blank browser window. No content, no menu - nothing.
Advise how to make content and menus available on the new SharePoint 2016 farm.
A SharePoint 2016 farm account has been added to administrators and site collection owners.