Check that your date and time are correct. Mine was set to 1-1-2014 1:01pm, I corrected it and the machine rebooted. Once it came up, I was able to add the device in the app gallery.
I have the same issue happening on an AltaLink C8030. I've had my shop tech Force ALTBOOT the firmware but that did not resolve the issue. I can add other AltaLinks in our demo room fine. Its just this one machine. I'd like to be included if a resolution is found. If I figure out how to fix it on my machine, I'll reply to this post.
I was just thinking a bit more about the issue described. Is the log in failing when you are attempting to log in to the App Gallery App while at the device? When you launch the App Gallery App at the device, are you immediately prompted for your Gallery credendials?
If yes, I think that the device may have an older version of the App Gallery App installed. You should reinstall the App Gallery App from the App Gallery Web Portal. Follow the steps outlined below:
Launch the App Galley web portal (https://appgallery.services.xerox.com/#!/home).
Log in with your App Gallery account credentials.
Click the Devices tab and add the AltaLink Device.
Select the All Apps tab.
Browse to and click the App Gallery App icon.
On the App Details screen, select the Install button.
Agree to the terms and conditions.
Select the device and then click the Install button again.
Once the install has completed, give the App Gallery App another try from the device. It should be behaving much better now (not prompting immediately for credentials when launching the app) and you should be able to successfully log in.
If you have any trouble adding the device to the App Gallery, installing the App Gallery App or if you are still prompted to login immediately when launching the app, please let me know.
The appl gallery keeps saying the username or password is incorrect. I have triple verified that the info is correct, but it still says it is incorrect.