Sorry for posting here a question regarding A80 plus, I didn't find a section of the board for this model. I have the same problem described in  https://bbs.blackview.hk/viewtopic.php?f=330&t=542507&p=994536
I tried all the solutions applicable to the A80 plus, but without luck. Not being notified of messages in WhatsApp Business is really frustrating. Moreover, since I use a third-party program for SMS management (mySMS), several messages get entirely lost when the app is killed. This is the only problem in an otherwise very good device. What can I do? Thank you!