Applications list , in Notifications setting, not contain an existing application

[Members_FTyXBFX]

I have some applications, installed on my Phone, but those are not shown in Notification setting/Applications list (with all selected)

[BandOfBrothers]

Where did you aquire these applications from @Members_FTyXBFX  ?

Can you provide more information on what the applications are called too.

[AndrewL]

@Members_FTyXBFX: If you head to Settings > Apps > Tap the 3 lines with the downward facing arrow to the right of 'Your apps' > Show system apps (toggle this on) > OK, then check the list below, are the apps visible here?