There is no notification on Whatsapp and Telegram

Hi there! Telegram thankfully has a few solutions for you to restore the notifications on your iPhone

Notification problems (https://tsf.telegram.org/manuals/bugs#notification-problems)

iOS:

• Make sure notifications are on in Telegram AND in phone settings (Settings > Notifications), check app version.
• Make sure notifications weren’t disabled for a specific chat or group.
• Shut down Telegram (go to home screen, swipe up or double tap home button, swipe upwards on Telegram), then go to Phone Settings and disable alerts. Relaunch Telegram, go to Phone Settings, enable alerts.

The whatsapp howto is much larger, so for readability, I have pasted the article from them below

https://faq.whatsapp.com/iphone/troubleshooting/how-to-manage-your-notifications/?lang=en