Instagram notification sound not working

I have been Instagram for a long time & I always be updated to date with Instagram but now I'm facing an issue.

Actually, I'm not getting notification sound when Instagram appear any notification. I get Just Instagram notification but the sound, Sound is missing with notification and it just only vibrates but not sound.

I uninstall and reinstall latest Instagram version, I format my phone and refresh all the phone setting but still issue is the same.

Do yo Guys know, How can I fix this notification issue.