# X_PWA_VAPID_KEY_INVALID

## Means

the VAPID key pair is malformed or not a pair

## Typical cause

`ULTIMATE_VAPID_PUBLIC_KEY` is not a 65-byte uncompressed P-256 point, `ULTIMATE_VAPID_PRIVATE_KEY` is not a 32-byte scalar, or the private key does not sign for the public one (the boot signs a probe and verifies it)

## Fix

`x vapid create` — one command writes both halves, so they cannot disagree

[PWA and build skew](/error-codes#pwa-and-build-skew)