There it is! Statement of TOTAL FAILURE!
Video Pro X16 v 22.0.1.270 cannot succesfully write to DVD-DL discs.

It does not matter who manufactures the discs.
It does not matter who manufactures the disc drive.
It does not matter whether you use -R or +R discs.
It does not matter if you find AZo discs and try them.
Video Pro X16 v 22.0.1.270 cannot succesfully write to DVD-DL discs.

What does MAGIX Software GmbH have to say about that?
What does MAGIX Software GmbH intend to do about that?