Sorry, I don’t use Affinage colour.
Are you trying to replicate a colour that your client has previously had on their hair?
Looking online, it says the Affinage colour is dark chocolate which would normally be near to a 6/77 or 5/77 in
However, Wella has recently changed its colours using the new ME formula and I’ve not used these so I’m not sure if the new colours are the same as the old formula colours.
Your best bet is to try some test swatches and compare the results.