"The Sensor failed to register due to connectivity issues" when install Azure ATP Sensor agent on DC

[SB_082030]

"The Sensor failed to register due to connectivity issues" when install Azure ATP Sensor on Domain Controller running on Windows 2012 R2 . 

Any suggestion would be appreciated. 

[#2]

I looks like the sensor can't reach the cloud service. So, maybe you're using a proxy or there's no internet connection? Check the troubleshooting guide for more info:

https://learn.microsoft.com/en-us/defender-for-identity/troubleshooting-known-issues#sensor-installa...

[#3]

Thank you Thalpius !!!