Miracast works and doesn't work on 2 Lenovo T530

Hello,
I hope you can understand, i must use a Translater.
System:
Windows 11 22H2 22621.2215

Here is the Original Thread Miracast geht und geht nicht auf 2 mal Lenovo T530 - Deskmodder.de

strange thing


Background:
For a Girlfriend, I set up a T530 with Windows 11 almost perfectly using an inplace upgrade.
The T530 is Miracast capable, according to dxdiag. If you run dxdiag and save the report as text and search for Miracast everything is fine, I attach the diag text.
But:
Miracast: Not Supported by Graphics driver.
But it doesn't matter, just read it and lo and behold,
The girlfriend's device connects to my TV and to a WIFI dongle without any problems, e.g. Windows key +K.

Now the weird.
I have exactly the same T530, with the same diag analysis. Drivers are exactly the same and even installed a cleaninstall windows 11, same version as girlfriend's laptop.
Typical again:
My T530 connects for 2-3 seconds. You briefly see a black screen on the TV and then the connection disconnects.
That's why I also installed the Wireless Display feature, which doesn't help at all, then even a newer graphics driver,
problem persists.
Ask:
why works it on the girlfriend's T530, there it was an inplace upgrade from Win10 to Win11; and neither the Cleaninstall nor older Win10 and Win11 versions work for me.

Old thread but if you're still having an issue maybe try checking this setting on the problematic laptop?

I had a similar issue trying to cast my screen to my lg b9 tv
Note: I'm on the 5GHz frequency for my wifi on PC and on my TV (LG B9)

Go to Network Connections - right click on your network adapter and click Properties - Configure - Advanced then set 802.11a/b/g to Value: 5GHz 802.11a

If it's showing different value options for you, try all of them and see if it works. Make sure it's the same frequency for both of the devices you're trying to connect so if your tv is on 2.4ghz wifi then try all the 2.4gz values on your laptop.