If I understand you correctly, you installed Duo Authentication for Windows Logon on your server, but found that you could not log in afterwards. Then, you went into the Duo Admin Panel and deleted the RDP application ties to that Duo install.
If that sequence of events is accurate, then you are receiving the “Invalid integration key in request credentials” message now because the application whose information was used to install Duo on your server no longer exists.
You have a few options at this point:
- Boot into safe mode to uninstall Duo: https://help.duo.com/s/article/1088
- If you accepted the default “fail open” setting and have physical access to the server, disconnect the network and log in at the console to uninstall Duo. If Duo for Windows Logon can’t contact the cloud service and the application is configured to fail open you can log in.
- Similarly to #2, if you accepted the default “fail open” setting and have remote file system access to the server (like via the UNC path
\\servername\c$), you could add an entry for your Duo API host with a fake IP to the server’s
hosts file, and then RDP to the machine to uninstall Duo.
Please contact [https://duo.com/support](http://Duo Support) if you still can’t get into your Windows system.