How do I fix blank WhatsApp screen on iPhone 7?

Here is a solution from one of our contributors you can give a try which seemed to work for many people.

There is a solution from Mr. Bektaş from in Turkey.

1-Delete and install WhatsApp from AppStore.

2-Open it.

3-Enter phone number.

4-Skip iCloud step.

5-STOP when it asks for “your name”. STOP.

6-Close Wi-Fi and Cellular data.

7-Return WhatsApp, enter your username.

8-Continue. No blank screen.

9-And open your internet connections(6)

WhatsApp shows blank screen on iPhone 7 P… - Apple Community

If that doesn't work you'll need to contact WhatsApp Support for assistance.

Contact WhatsApp support. They have had numerous issues lately. They will have to troubleshoot your issue. Make sure you have the latest iOS on your iPhone. The last version of WhatsApp that I saw in the App Store will support iOS 15.1 and above, so you should not have any problems.