The situation is that the M2 adapters often do not coincide by the contacts on MB. You need to look carefully at the contacts and see how they coincide with the contacts on the board (from the contacts there are scratches on the adapter). http://picua.org/img/2017-10/08/m7vw8fkeqt3lulf03lz2ol1fc.jpg

You may need to slightly move the adapter to the right or left of the key. It may be necessary to enlarge the hole for the key on the adapter M2.
http://picua.org/img/2017-10/08/7uqihpvdahbgsgwc98wkdvcol.jpg