Does any one know why it does it 2 times back to back? Every time that thing comes up I put in the code and it asks for a second code. This happens about 3 to 4 times a day. I'm nervous that it will happen at a critical launch either to save my fleet or get someone's fleet. Is it totally random or only when raiding?

It's case sensitive. If your seeing it right after entering it then you didn't capitalize something it wanted you to.

It seems more prevalent in some servers than others. Very rarely does it happen in Standard. Unless you are looking through system after system and even then it doesn't happen too often.

As Doomrager says, case sensitive. When it happens to me it only happens the once. Whether you click with your pointer device or press enter/return might have a bearing on it?

I didn't mess up on case, unless it's not showing the case properly on my tablet.

What about clicking after entering the code rather than hitting enter or return?

I'm using a tablet, so clicking the continue is how I do it.