Samsung Tab S7+ with LG usb-c display not working

[RevDog]

I've got a Samsung Tab S7+ and an LG usb-c display.
I used to have no issues plugging my tablet in and having it display on the screen. I'd then have access to mouse and keyboard which are connected to the display. Now the tablet doesn't even recognise the display (it just charges its power). The display doesn't recognise the tablet as sending a video signal. Turning Dex on/off doesn't help and neither does restarting.

I think this must be to do with an update. Can someone help?

 

[RevDog]

Since no one replied..... here is a tip: I could use the tablet with the usb-c ultrawide display with the right usb-c to usb-c cord. I have two ultra-wide LG monitors (one at work and one at home). One cord that came with one monitor didn't work on either monitor. The other cord works on both!!
A usb-c hdmi adapter worked, but it was much less convenient given I already have mouse/keyboard..etc already in the monitor usb ports.