Whatsapp blue tick not always working

Hi huvinesh,

Thanks for contacting Apple Support Communities!

We understand that you have questions about the features of WhatsApp.

Since WhatsApp isn't an app developed by Apple, you may consider reaching out to WhatsApp support directly for help. If you need help to locate the contact information for WhatsApp, you can refer to this article: How to contact an app developer - Apple Support

"Contact the developer of an iOS, iPadOS, or watchOS app

1. Open the App Store on your iPhone or iPad.
2. Search for the app, then tap it. If you can't find it, tap the account button  or your photo at the top of the screen, tap Purchased, tap "Not on this [device]," then tap the app.
3. The app's product page appears. Scroll to the Ratings & Reviews section, then tap App Support. If you don't see App Support, make sure that you're signed in with the correct Apple ID."

Take care!