As @patchsurfer says - def worth a step by step walkthrough from one of the sites.
And for what it’s worth - sometimes once I’ve messed with Rear or Front Der adjustment and it hasn’t worked I go back and start again, doing the full set up from scratch with the cable loose. And it tends it then work.
Odd though just moving a bike where it all must have been working ok, to a trainer. I’ve seen the tiniest differences myself before but nothing warranting much faffing, across 4 different bikes - sounds like you’ve got unlucky !!
If it’s 10sp … is there a spacer thing going on maybe?