You shouldn’t have to download rumble.
What seems strange to me is that it asks for your phone number again after you already did the verification.
Yeah I dont get it either..when I put in my email address it does not ask for the phone number only after it says “Verified” after I click on the email link, than it asks me to create a password which I do, than phone number than it says “oops something went wrong try again”
Im FINALLY on it..redownloaded the app and went through the steps and it worked..my user name is @Lakerfanalways