After the Android 10 update on the Galaxy S10 notifications have been either delayed or non existent. Battery optimization is turned off as well as do not disturb and it still happens. I also tried doing a factory reset and setting everything up again and the issue is still occuring.
I found the same results . Uninstalling and reinstalling an app gets it working for a short period but then it goes back. The same was for when I did a factory reset on the phone. Gmail seems to be the most affected by this issue.
Ok, so I was suffering from the same thing.....Battery Optimize is off on Gmail, Twitter, Facebook, Instagram, and yet they'd only pop up when I unlocked the screen. Sometimes Gmail notifications would be over 90 minutes behind.....I tried everything. Even a factory reset. All battery setting were off. I even tried High Performance mode, and still had big delays. I tried something new... and it seems to help a bit. Not perfect, but a tad better:
Under the DEVICE CARE, and under APP POWER MANAGEMENT, try removing all apps under SLEEPING APPS, then DEEP SLEEPING APPS, then restart the phone.
For me, the phone seems to get more notifications sooner. If you have anything in these two catagories, it seems to disrupt the notifications.
Thank you all for reaching out! I am looking into this further. @nightshadow4k your information is very helpful! As soon as I find out more information. I will follow back up with you here.
Have you not found a solution yet? I have the same problem with my Fitbit Versa. It no longer notifies me of phone calls coming in and doesn't display text messages.
This same issue seems to happen on a Pixel 2 with Android 10 as well. This may be an Android 10 issue and not specific to Samsung. Maybe Samsung can fix the issue without Google. Does not seem to be related to Fitbit at all.
Six months later and it's still an issue. I'm seriously looking into downgrading to Android 9, or simply just getting rid of this thing and get something that works.
Android Notifications have been around since, I don't know, Android 1? It can't be that we're regressing at this point.