Instagram DM, Facebook messenger notification issue

Please tell us some basic information before asking for help:
- Model Name: Rog phone 3 strix 12/128
- Firmware Version: WW_17.0823.2007.47
- Rooted or not: Rerooted
- Frequency of Occurrence: always
- APP Name & APP Version (If your issue relates to the app): Instagram, Facebook messenger, Airbnb, DingTalk, etc last version
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
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I can't get Instagram and Facebook messenger's notifications and other few apps also.
I already tried whole things can do.
Reinstall apps, change battery settings, background settings and so on.
but I still cannot get notifications.
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Comments
I suffered with most apps, including google messages, gmail, outlook, etc. I did a factory data reset and looks to be fine now.
Oh.. nuhh I already set lots of things.
Maybe you have set those apps to not be allowed to auto start in the auto-start manager?
I allowed.
I tried whole of things to do.
(I use Korean language)
How can I solve it??