Hi!

Since I haven't seen an answer posted to your question from earlier, here goes. Yes, QSOs between two stations on the ground through the ISS is acceptable for LOTW. Use the satellite name "ARISS" for the ISS, as shown in the LOTW FAQ:

https://p1k.arrl.org/lotw/faq

(all the way at the bottom of the page)

73!

Patrick WD9EWK/VA7EWK - at LAX airport http://www.wd9ewk.net/