In short: check the bracelet's orientation, that the pins are free of dust, and precise alignment with the lugs. Never force it.
Check 1 — orientation
Make sure the bracelet is positioned the right way (top toward the dial, bottom toward the case back).
Check 2 — pin cleanliness
Dust or residue can jam the quick-release mechanism — a quick cleaning often solves the problem.
Check 3 — alignment
The pins must be perfectly aligned with the lugs before pushing — a bad angle prevents it from clicking in.
If the problem persists
Contact Royal Pop Style customer service: a manufacturing defect remains covered under the fit guarantee.
