Unassembled MEK blueprint upgrade

[skuik]

Hi, I have a little problem and I can't find how to solve it, context:

I have three MEK schematics not assembled I would like and I try to upgrade them via the Tinkering Desk but it doesn't work and even with the mods upgrade station either, yet on a solo game it works would you have a idea of ​​which settings influence the possibility or not of improving are MEK

thanks in advance