OK, it seems V14 has a known issue with certain video cards or drivers or something. This could make sense because mi machine and my wife's machine are exactly alike in HW and in SW except that she is using the onboard Intel video and I am using an NVidia Gforce 730 card.
Over in the TV forum someone posted TV does not work with wayland graphics so if the computer you are trying to call into is using that, you will have to switch it back to "X".
The computer you are trying to call from, can use wayland. However there is an issue in TV and you will have to restart the service then you will be able to connect and see what is online. I use fedora, command is sudo systemctl restart teamviewerd
Can someone explain "Wayland" and "X" to me?
I tried to use the Intel onboard video in my machine and I messed up so badly that I thought I would probably have to reinstall Linux because I could just not get in. Finally I did manage to boot and get back in and I found a new NVidia control app in the system tray. All this messing might have changed something with the driver.
I am exhausted so I am putting it aside for now but I will be trying to see if the video configuration resolves the problem.
"X" is short for "The X Windows System" and normally referred to as "X11". This provides the GUI for all Unix based Operating Systems. X11 also provides "Remote Windows" over SSH where the remote machine runs the application and only transfers keyboard and video data between Remote and Client.
The X.Org Foundation leads the "X11" project.
I'm not sure what Weyland is, but I know it was proposed for Linux as some kind of "modern" X11 alternative with no "Remote Windows" facility, somewhat like Microsoft Windows which did not have "Remote Windows" capability before Citrix "Winframe" provided it for Windows NT after developing it for OS/2 as "Citrix Multiuser".