When you subscribe to a channel, you'll see new videos in your Subscriptions feed. The Home feed may also show videos from your subscriptions, along with recommendations for channels or videos that you may be interested in.
If you unsubscribe and then re-subscribe to a channel, your notification settings will be reset to personalised or no notifications. If you'd like to get a notification for every upload, make sure that you turn on all notifications.
You won't get notifications if a channel's content is set as Made for Kids. Also, the notification bell will be set to no notifications . You can't change this setting.
To get to your Subscriptions and What to Watch, follow these instructions:
Sign in to YouTube.
In the Guide, click Subscriptions.
To see your subscriptions in a grid or a list, click Grid view  or List view .
Troubleshoot a problem with your YouTube subscriptions