Enabling customized Focus settings (Do Not Disturb, Driving, Work, Sleeping) may prevent notification receptions in an active Archiver App, or even if the App is in the background, as shown in the following examples:
Do Not Disturb
Driving
Sleep
Work
These Focus settings are toggled on like in the following Work example:
Work focus setting is toggled on:
Detailed specification of Work Focus notification exception allowance: