Any solution for "missing" messaging app badges on my S9+, after every issue checked already!?

[Android Central Question]

Any solution for "missing" messaging app badges on my S9+, after every issue checked already!?

Hello to All,

I just upgraded from S8+ to S9+ that I bought in Guangzhou, China.

After a problem free smart switch transfer, all works fine But I cannot get messaging apps notifications (like WhatsApp, Messenger, Viber) IF I DO NOT OPEN THE APP.

BTW I do get notifications badges from WECHAT, who appears to be a non-Google origin app...

Thus, I cannot see badges count, and no notifications works, whatever their configurations. I simply do not receive the messages sent to me by third parts.

Only After I open WhatsApp app, I get the sent messages and the notifications works suddenly.

Also, if I untick and tick MANUALLY the SYNC option in the quick-set widget icon (in the notification toolbar), it "opens" the flow of the nessages and the badges appears immediately!

The phone comes with android 8.0.0 and has been bought 8 days ago.

I need your help, after trying so many options.

I will be ready to supply more details if needed.

Thanks in advance.

Daniel