Does not scan barcode

For some reason it does not even scan the barcode. So I cannot even log in to the account. It is useless. And it is silly as this is my third time try to write a review for duo mobile. The previous two times both said the usernames were taken. Instead just change the username, it just erased everything. Very tired!

Ppggchdvbv3678 about Duo Mobile, v3.11.1