Edit: Original answer was wrong; all credit to BillJ for the correct answer (in comments)

Although the so clause is finite and hence appears to be an independent main clause, it is in fact subordinate (dependent). It gives the purpose of us giving access to Las Vegas again (hence 'purpose adjunct'). It is marked as subordinate by the subordinator "so"; thus the clause must be subordinate, not independent. Adjuncts are optional elements that are not required grammatically.

Edit: Original answer was wrong; all credit to BillJ for the correct answer (in comments)

Although the so clause is finite and hence appears to be an independent main clause, it is in fact subordinate (dependent). It gives the purpose of us giving access to Las Vegas again (hence 'purpose adjunct'). It is marked as subordinate by the subordinator "so"; thus the clause must be subordinate, not independent. Adjuncts are optional elements that are not required grammatically.

Both

"Are you going to be able to give us access to Las Vegas again?"

and

"We can at least jump back and forth between the servers to find files."

are valid independent clauses. You're creating a compound sentence, and connecting them using a conjunction. Therefore, you need a comma before the conjunction ("so").

Edit: Original answer was wrong; all credit to BillJ for the correct answer (in comments)

Although the so clause is finite and hence appears to be an independent main clause, it is in fact subordinate (dependent). It gives the purpose of us giving access to Las Vegas again (hence 'purpose adjunct'). It is marked as subordinate by the subordinator "so"; thus the clause must be subordinate, not independent. Adjuncts are optional elements that are not required grammatically.