What should I do for my 90-day report-in if I am out of the country when it is due?

B

you misunderstand how the 90 day reporting works 😕

You ONLY report if you're IN the country when the 90 day report is due

SO if you're going to be out of the country on/by that date, you don't report.

When you re-enter the country your NEXT 90 day report is due 89 days from the date you stamp back in.

Now whether the online system will work for you or not when that next report is due you will have to try and see. You can apply online up to 2 weeks before the due date, so apply early and if it's rejected you have plenty of time to go in person and file