Push to talk’s option does not work (for me)

I have looked at comments about Push to Talk not working; however, I have not seen how to correct the problem or the user is using version 5.
I have tried using mouse button 4 or just a simple keyboard Q.
Using current version TeamSpeak 3 version 3.5.2 on windows 10 64bit.
Belkin n52te game powered by Razer.
Mouse is MS IntelliMouse.
I see there is a Client Log, would searching that give me information as to why Push to Talk is not working? If so what should I look for and what option would you recommend debug, errors, or warnings. I presume it is not worth looking at Critical because Team Speak does not crash.
In short… what is the best way to resolve the problem ;).