The Odoo iOS App (version 3.1.15) does not work anymore when 2FA is activated (on iOS 14.4.2). Immediately after entering the credentials, the app crashes. This has been tested on multiple iOS devices and accounts. Unfortunately, this problem can also be found in the feedback in the Apple App Store.
After turning off 2FA, the App will work again.
We have exactly the same problem.
iPhone 12 iOS 14.5.1 - Odoo App Version 3.1.15
2FA enabled.
Same