First (10fold) nr is that of compartment-and it will have 6 beds/seats- nr 1-6, so f.e. 27/8/9  and 30 do not exist. There should even be some logic as to which ones are to the window as seat or lower as sleep. Try to swap with others is likely the best strategy.

81 and 86 are in the same compartment, 92 is in the next compartment:

https://www.seat61.com/sleepers.htm

Try to swap with someone.

Most likely there were not 3 bed in the same compartment available when you made the reservation. You can ask on the train if someone can change beds so that the three of you can sleep together.

You really need to contact the company you got the reservation from, this forum has no direct link to them or Interrail.

Thanks I have checked with seat 61 and I still don’t think we are together 

Thank you - yes they are the numbers.

can you send the link for me to look at?

Double check your numbers and if they are as your post check with your reservation provider.

Here is a link to seat 61 on night trains in France including a couchette plan. It also suggests you could get a full cabin to yourselves.