"We support you."
Translation:Vi stöttar dig.
Nope, when it's used like this they mean the same thing.
Architecturally they are slightly different, but they still both mean to support something.
Your sentence would sound like "We support he".
"Ni" is to "Er" as "He" is to "Him"
Dig is accepted but says the spelling is wrong and should be dej? I haven't come across that spelling yet...
dig is the default - I'm guessing you had a minor spelling error and Duolingo wasn't smart enough to show you the closest translation.