Hello
I probably encountered a similar problem when sending a push notification, but it is delivered to the device without sound and screen unlocking. Previously (about 2-3 months ago) it was delivered with sound and screen unlocking.
I tried all sorts of variations of iPhone settings for notifications (turned on and off silent mode, display of thumbnails on the locked screen, etc.), none of this helped.
! However, disconnecting the Apple Watch from the phone helped, when they are not connected, the push comes with sound and screen unlocking.
What can be done about this?