Wow, it seems you guys got the Chinese version of the TA-1062 where the seller flashed the global ROM on it. I don't think your device will be certified from the playstore as it has been modified. I also have the TA 1062 but mine is the Taiwan version (android one). Currently on the June security patch.
You guys should wait for the Android P update and try to flash the WW Android rom. Nokia 6 2017 China varint had the same problem when converting to Ww rom but with orio update the TA-1000 culd be changed to TA-1003 and after that OTA updates also got available. Search convert TA-1000 to TA-1003 in xda developers for that. Hope 7 PLUS also upgradable like that but I can't promise you guys that.
started a topic a day ago
I just found a working trick to certify Nokia 6 in playstore, my Nokia 6 is also uncertified after service centre flashed it.... TRICK- First of all u need (1)- OST tool 6.0.4 version... (2)-PC running windows 10 ( use any but works perfectly without drivers issue in windows 10) (3) SD card (4) Data Cable... (a-)First off all install the OST tool with patch... (b) Download Firmware update of TA 1021 India from the net, extract it ,it should be .nb0 extension (c)- Download December 2017 security patch of naught of TA 1021 / TA 1023 ,put it in SD card (d)- Now reboot to recovery menu using hardware buttons to install this update from SD card... Select apply update from SD card... Phone will end the operation with error i.e update is aborted... Again using hardware button power off your phone... ( We apply December update to downgrade Bootloader) Now open OST tool, select .nb0 file that you selected.... Flash it, it will take around 3-5 minutes... Now you downgrade to naughat 7.1.1 Now check for updates again... You will get oreo via OTA... After installation of oreo via OTA your phone will become certified again... And you will recieve all security updates upto September month... Cheers happy flashing... Trick working 100 %<