Some devices not downloading OBB from playstore

We have a game currently in open beta in playstore which has its apk and obb split and its working fine in most devices. But some devices are not downloading the obb file from playstore. Anyone has any idea what is causing this issue ?

What we have already tried :

• Write permissions switched to external

• Implemented the obb downloader plugin which is currently detecting that files are missing but wont download it from the server on these specific devices alone(gets stuck at connecting to server). The obbdownloader works fine on other devices and downloads necessary files if we manually delete the obb file.