The fact is that the PoB-Move requests are answered very inconsistently.
Sometimes it works and sometimes it doesn't, without it being clear to me in which cases it works and when it doesn't. The answers to this are extremely vague.
It is also not clear to me why an IFF change is impossible. Ok, let it cost money or sci-data and only do it via SRP request, but why this is not done is not clear to me ...