Try deleting the app and reinstalling it. Should clear the settings and let you try logging in again.
I am having the same login issue with the My-Wi-fi app. The message I get is slightly different (see pic below). I have tried uninstalling and re-installing the app, turning the mesh pucks on and off and turning the main modem on and off - none of which solved the problem. I called Telus internet support and the person there had no clue except trying to reset the boosters to factory standards, which Indont want to try because if the app still won’t log me in I won’t be able to set up the mesh network again. Anyone have this issue and solved it?
Not having the login issue, but wanted to share that the Boost devices have a web interface, which you can access through the IP address assigned them by your Actiontec router.
You can login to My Account independent of the My Wi-Fi App, correct?
BTW, are the Boost devices sharing the SSID of your Actiontec?
I have not had success with using the App on iPad, as it is not a Universal App. The app does not register properly on the screen at all. I've stuck to using iPhone for management of the devices.