Remote support via TeamViewer without active Windows login ends in "this screen cannot be captured at the moment This is due to to fast user switching or a disconnected/minimized remote desktop session" -
Remote Session Toolbar on Windows - TeamViewer Support
How to Keep TeamViewer Running 24x7 for Remote Access
windows server 2012 r2 - Team-viewer disconnected after disconnecting from remote desktop connection, why? - Stack Overflow