Remote Control not working for Android 6

Team Viewer Host used to work earlier with Android 6. But now when I try to remotely connect a device with OS Android 6, we get a message that 'Your Partner has refused your connection' or something similar. This is occuring in 2 brands of Tablets and was working OK on both brands a few days ago. Also the solution still works on higher Android versions. Can you suggest what could have gone wrong. How can I find this out?