The solution for this issue is posted here:
I just did what Krishna did, using the Pulse app and its working so far. OMG thank you for that.
I am using NOKIA6, After NOV monthly security update, we are facing this issue. Even NOKIA support team doesn't have proper info about the fix and ETA. Try this work around: disable and force stop the default 'messages' app and download any third party sms app ( I am using 'sms organizer' app of Microsoft) and make this as a defult message app. Then in the battery setting --> activity manager --> white list your sms app. This is working for me.
Android Messages, Carrier Services, Contacts and other standard apps in Nokia branded Android phones are developed and maintained by Google LLC.
(You are barking up the wrong tree).
Please make sure all apps are updated to their latest versions in the Play Store.
There are several Gigabytes of other updates before and after Android 7.1.2.
If you developer unlocked and modified the phone OS and settings, or installed apps from unofficial sources, then please consider a factory reset and do a fresh start without restoring a backup. Next enter your Google account and apply any further updates before adding third-party apps or modifying the standard settings.
Please keep in mind One Time Passwords, bank messages and more are often sent from withheld numbers. And if you previously used an iPhone then iMessage must be deregistered in your Apple account ... to receive texts from iPhone users.
My TA-1021 Nokia 6 works as expected regarding phone calls and messages since I bought it 6 months ago.
3rd party messaging apps and clearing caches do not solve the problem, all the proposed fixes the customer care team gave me did not work. Nokia has no fix after a month, it seems as if they really just don't care at this point
There is a similar post in Nokia 5 discussion forum.
Check if you have an update on play store for the Carrier services and alternatively try Pulse / Textra, 3rd party messaging applications. I switched as I felt the default Android Messages application was the issue.
haven't used any third party call blocker related apps.
There are no blocked contacts, all contacts are white listed.
After applying the latest security patch update from nokia. not receiving any messages.