Whether you just missed the sign-up period* or you're having trouble logging in**, my buddy ShadowRockZX has taken the liberty of recording *tons* on Rockman X DiVE gameplay just for you!
ShadowRockZX's playthrough is on-going, so it's not exactly a complete run just yet. However, he has uploaded all of Chapter 1 (above), Chapter 2, Chapter 3, and a livestream of Co-OP Mode that's happening right now. Hit up those links and check it out, if you're so inclined!
*Additional slots are opening up soon!
** Contact Capcom Taiwan directly with any issues at firstname.lastname@example.org with the title “RXD CBT Acct&PW Inquiry”