Our problem is also similar. But luckily while moving to us my spouse email embassy for “follow to join”. And her D-260 got updated making me accompany.
I am filing the form using guidance in youtube but almost all the guidance while filing petitioner gets spouse option in the dropdown menu. but while filling my d-260 form, the petitioner tab doesn’t present spouse to be a petitioner. Where possibles we are wrong at please need help.