Amazon is being super aggressive with their login walls lately! If she doesnt have an account, she is probably gonna get blocked because of how their session cookies and auth tokens work now. Its annoying!! Honestly, skip the Amazon hassle and look at Herman Miller. Their build quality is just fantastic and the ergonomics are incredible! Just get any office chair from them and youll be set. Love their stuff!

Did this last week, worked perfectly

I saw your post earlier and honestly, Amazon has been making it way harder to browse without being logged in lately. Its basically their way of tracking data and forcing everyone into their ecosystem. If your sisters getting hit with a login wall, its probably a session cookie issue or just their security protocols being extra aggressive. I switched to using the Amazon Wishlist Chrome Extension a while back and it makes managing these lists so much easier, honestly I've been super happy with how it works. For the chair though, if she cant see it, maybe just send a direct link from the manufacturer? If you want a really solid ergo chair that actually lasts, just go with any of the office chairs from Steelcase. I've had mine forever with no complaints and they are built way better than generic stuff. Plus, their own site wont block her just for looking at colors.