If you are on STEM OPT, you must make a "validation report" to the Office of International Education and Services every six months starting from the date the 17-month extension begins and ending when your F-1 status ends, you change educational levels at Southeast, you transfer to another school, or the 17-month OPT extension ends, whichever is first.
This report must be made by you as the student, and updated in SEVIS by the DSO in the Office of International Education and Services at Southeast, even if your employment has not changed. This report must be submitted within 10 days of the report due date. If you are submitting this information at a time other than when it is required, it will be ignored.
Validation is required after 6 months on STEM OPT and after 12 months on STEM OPT. It must be done within 10 days of each of those dates.