[yrro]

Sadly Microsoft and Apple have gone out of their way to make it difficult to access the same UDF filesystem from both Windows and macOS.

macOS will only access a UDF filesystem created on a disk device. Windows will only access one created inside a partition.

Linux, naturally, has no problem handling both. ;)

[fulafel]

A sibling comment linked https://github.com/JElchison/format-udf which claims that it creates a whole-device FS which works across all 3.