Solved
I get this error message when trying to link my bank account “AuthenticationFailed INPUT”
Original commenter did not share additional details
Can we ask is it an apple device you are using.
If so can you try one of the steps and one of them should resolve your issue?
partnerauth.platform.intuit.com’s
Steps to try make it work
• Complete an NVRAM reset (contact Apple support or search for the process)
• Reset the router
• Use a different network
• Use a non Apple computer
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.