Windows 10 is rife with problems for mirroring reverting to Windows 8.1 is you best option
Are you having trouble using mirroring on Roku or the Fire TV or any other supposed Miracast receiver since you upgrade to Windows 10? You are not alone. See this post from the Roku Forum here. Amazon Fire TV users have had problems too. This is a post from Amazon’s Forum.
Why are there problems mirroring on Windows 10?
Because the folks at Microsoft and the folks who developed Mirracast or WiDi and the teams at Roku,Amazon and
various TV manufacturers do not work together and test everything before various programs and operating systems are updated. Despite the different names, the two standards are actually just forks of each other. For more info on this see here. The reason it happened is that Wi-Fi Direct and WiDi was never adopted as the full industry standard so there was no motivation to make sure that it would still work once Windows 10 was launched.
There is good news and there is bad news. The bad news is that despite a number of how to’s that you may run across, explaining the simple procedure for mirroring there are some real problems with mirroring with Windows 10. I have been looking into this for quite some time and for the most part it appears that once you have Windows 10 there are a couple of options to fix the issue.
Despite what you might read on message boards, the easiest way to actually fix mirroring on Windows 10 is to ditch Windows 10. There are a few ways to do this. Because these are not my recommendations. I am going to refer you to the Microsoft page that explains the methods for reverting back to Windows 8.1 from Windows 10. So, unfortunately, there is no easy way to enable mirroring on Windows 10. If mirroring is important to you check out the page.
See the Microsoft support page here.