I discovered this when I assembled my R01, but forgot it. To fully insert (so it “clicks” into place) the microSD card you need either very long nails, a toothpick or another instrument with a blunt edge.
Or a credit card, or another microsd card
Does the spare power button cap work as a tool too?
I recently assembled DevTerm R-01, I can insert and remove Micro SD card by hand without using any tools.