This thread is intended for desktop-linux.
When I click ☰ > Tools > Summarize, it says that I need a Kagi subscription (which I have). But when I try to log in through Settings > Plus > Restore Purchase, I get a placeholder message:
WebKit web page with "Log in to Kagi" options

Orion should display a working Kagi login page, or, ideally, read my existing kagi.com cookie.
Orion 2.49.1, openSUSE Tumbleweed
Linux - Describe Below