UHD to Blu-Ray - Disk not playable in UHD Player

[Nighthawk66]

I´ve tried 4 UHD Disk(German), BumbleBee, Van Helsing, King Kong and Battleship. I convert this 4 Movies with UHD to BluRay without any Error.
Then burned with Nero 2016(UDF 2.50) or with DVDFab the BluRay to 50GB BD- R or RW. The DVD Fab Software is up to Date.
But after burning, the Disk is not runnig in my UHD Player or Xbox One X. When try to play on PC with VLC Player, i get the error that this Disk is not authoring in the correct UDF Format? WTF
Sorry about my Bad English.
BTW - i´ve a LG an a Pioneer Burner - same Result
Open the Disk via Exlorer an open the videofile "manualy", the movie runs with VLC...hmmm
In the last week of April, i convert John Wick 3 with UHD to BluRay without Problems. And the Disk runs flawless.
No Hardware changes, only DVDFab Updates..

[Nighthawk66]

Solved, i've used the Bluray Creator and burned the Movie with the Creator and the Movie runs. With Nero Burning it dosn't work. Btw, i found out, These are all Universal Movies