Knew I had seen this in a review somewhere... Just had to find it.
From Android Authority's LG G5 Review:
"Before you get too excited about the Hi-Fi DAC though, it’s not going to work with G5 smartphones sold in Korea, Canada, Puerto Rico or the USA; LG declined to comment on why it won’t work with these devices (and why listings were pulled in the US), but it’s worth keeping this in mind if you planned to buy the G5 in one of these markets and wanted to buy the Hi-Fi Plus."
Link:
http://www.androidauthority.com/lg-g5-review-684737/
Another part from a separate Android Police Review:
"By the way, it sounds like unless one of the US carriers decided to actually stock the B&O attachment, it won't come to America at all. LG's current version of the dongle is not FCC certified and US phones *refuse to boot* when it is inserted, so don't go importing one and thinking it'll work."
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