This is my second international trip in recent weeks; and for the second time the DL website won't let me check-in online for the international flight- probably because of Covid verification, etc.

I have two separate tickets one domestic; and then a "connection" to an international flight (on a separate ticket). I can check-in online for the domestic; but not the international... If the check-in line is too long at the airport - can I just go through security with my domestic boarding pass; and ask the Sky Club agent or a gate agent to check me in for my international flight?

No checked bags; the only hiccup I foresee is if the Sky Club, or gate agent aren't accustomed to checking foreign passports, Covid test, etc.

Thoughts?