Microsoft has reported an issue with Azure AD Connect 18.104.22.168 and Hybrid Azure AD joined devices. They recommend not deploying this version if you have deployed Hybrid AAD join.
This version has been removed from manual download until their incident investigation is complete. The latest version available now on the website is AAD Connect 22.214.171.124.
Details of the incident are not available, but if you have deployed AADC 126.96.36.199 and are experiencing problems, I recommend completely uninstalling AAD Connect and installing version 188.8.131.52.