Cannot Sign Up to the mobile app

I redownloaded the application from the Appstore several times, but still didn’t work… so frustrated

hi @Roooonan ,

Which phone and OS are you using?

From your title of Sign up, I suppose you are trying to register.

As an alternative, can you register on ?

Let us know if you encounter any difficulties.

Thanks for your reply! I’m using iphone12 pro with IOS 14.8. I have successfully signed up and signed in on my friends’ iPhone12, but back to my phone, the particle mobile app still reminded me “Cannot sign in - Unknown error occurred” . What should I do?