some home computers cannot get into WSEServer 2016 due to repetitive activex message.

I am my employer's technical administrator.
We just switched to a Windows Server Essentials  O/S and I am having troubles with remote access from home.

My wife's dell laptop windows 10 works fine:  
1.      open IE 11
2.      remote.mydomain.com  
3.      enter my credentials
4.      select cpu name "MainServer"  
5.      enter credentials again  
Voila, I am at the master desktop and I can administer things from home.
I try the same thing from my Lenovo t460p windows 10 computer and I get stuck at step 4.
The webpage want to run the follow add-on: "Remote desktop services Active X from Microsoft corporation.

I click Allow and the same message pops up again and again and again and again.

I went to ie11 manage addons and discover that Microsoft RDP Control is already enabled.
I then googled the error and eventually discovered that I need to add Romote.MyDomain.Com to internet trusted sites.

But, I did not need that step on my wife's computer.

Why do some computers requires the extra manual step and others do not?