I know how to add from the web portal, but this particular provisioning profile is marked as \"Managed by Xcode\", therefore, I need to either stop managing from xcode or add a
Connect the phone to your mac and open XCode. Then click under Window->Organizer under Devices you must see your connected phone. There is an Button named "use for Development". Click this and after a few seconds the UDID must be in your team profile and you can install the app.
IMO you cant add devices to your team-provisioning-profile without connected to your mac, if this profile is managed by xcode. Alternative make an ad-hoc-provisioning-profile.
Hope that helps?
Go to: https://developer.apple.com/account/ios/profile/edit
Here is what worked (multiple times now) ...
Voila!
If you simply add the device's UDID to the developer portal, it will be automatically be added to ALL provisioning profiles. You can confirm this by downloading the profile and inspecting it (in plain text editor).