Hi, a few things to check:
PMUSR when im in the Owner profile I dont get notifications from Session app
Have you allowed the second profile to run in the background? Should be enabled by default.
PMUSR I have turned the setting on for cross profile notification.
Have you turned it on from within the secondary profile (not the owner profile)? My understanding is that it's per profile and only applies to notifications originating from that profile.
PMUSR I have set the notification setting in Session to "instant".
Have you installed and enabled Google Play services on the secondary profile? IIRC Session's instant notifications require it.