Syncing does not work?

I have the free ones on my android and my PC. I have been trying to sync them to each other, but my mobile says I need to enter an approval code in my main device, and I don’t see any areas to enter this code on my PC! Then, my PC will not sync because I need to authorize access from another device for it! See my issue? I am lost on what to do. I’m using 1 account for all my stuff and logging in thru Google.

What are you trying to sync ?
What exact products do you have installed ?