Try this it worked for me:
On Windows Server 2016:
1) Make IE your default browser(if its already not)
2) Go to Server Manager > Local Server > Disable Internet Explorer Enhanced Security
3) Go to Internet Explorer > Internet options -> security -> uncheck enable protected mode -> accept
4) Go to Internet Explorer > Internet options -> Privacy -> Site -> enter "logmein.com" and click Allow
5) Restart LogMeIn Control Panel or Restart Server
6) Try logging in again and it should work