Question about Verbatim PMT-15 Portable Touchscreen Monitor 15.6" Full HD 1080p Metal Housing

I'm having issues with an raspberrry pi 4.
booting from ssd is fine without any monitor attached.
but with monitor I get errors. probably a power issue (use of official raspberry pi power supply)

For me with Raspi 5 only picture works. Touch does not (yet?) work. OS -> Raspian

Image and touch work on the Raspberry Pi with this screen.
Unfortunately, I can't test the sound output in this combination at the moment, but it's not that great with the PMT-15 anyway.
If you don't have a micro-HDMI cable yet, you may have to buy one separately.