I have been doing it. I need to transfer the kids miles back to nectar. They only have 6600 each which is not useable really for avios but is £50 + as nectar. Trouble is I can only do 4 changes a year of accounts and managed to mess up one of them meaning I may have used by 4 but in reality only 2.
It definitely works online now but still takes 10 days for the conversion to appear on your nectar balance, unlike before when it was instant.
Avios to Nectar conversion working again, finally!
It's ridiculous it still doesn't work. So poor!
Eurgh, sorry you're right. Thought I got it working last night but no.