I'm having a reproducible problem receiving push notifications on macOS 26.2.
The pattern is that the push is received and then discarded almost immediately (there is a 60s expiration date) when on battery power and then when I plug in pushes start working and even if I unplug again it works for hours until breaking again.
These are alert notifications with priority 10.
Other team members have had similar problems but less reliably broken and even get a "stored for device power considerations" message followed by discarded (see apns-unique-id c29250a3-abbf-008a-96f9-a5384e32d1df).
An example from my machine with the apns-unique-id 6b2dfe3d-af99-182a-0e1e-6b811d3ec486 which fails immediately.
iOS is working fine however so this seems to be confined to macOS only.