Airplay not working between LG webOS and MacBook Pro

Hello

I have a problem connecting my MacBook Pro with my LG tv via airplay. The connection has worked previously but lately it fails.

At first the Mac looks like it successfully managed to connect, the Mirroring icon appears in menu bar and I can choose to mirror or extend my display. But the picture on the TV remains black and after some time the connection is closed with an error on my MB "Could not connect to "[LG] webOS TV ..."

From Safari, I can trigger YouTube to airplay on my tv or Spotify.

I have another MacBook which successfully manages to mirror it's screen on my TV, also three other iPhones are capable of doing that.

From the MB which fails to airplay to my tv, I can still successfully mirror the screen to my other mac.

Both computer are running the lates OS (this problem occurred with previous OS version too).

TV is also updated.

I tried looking into MB's logs but didn't find anything useful (I didn't know what to look).