X_PWA_PUSH_UNCONFIGURED
Means
push is not configured in this process
Typical cause
pushSubscribe(), pushUnsubscribe() or webPush() ran in a process whose boot installed no Web Push runtime: pwa.push is false, or pwa.enabled is
Fix
pwa: { enabled: true, push: true, vapid: { subject: 'mailto:ops@example.com' } } in app.config.ts; a test calls installWebPush({ store, keys, subject }) first