I feel like you’d have better luck on VinegarHQ’s server, but did you resolve this? Anyway try sudo pacman -S xdg-desktop-portal-gtk and xdg-mime default org.vinegarhq.Vinegar.studio.desktop x-scheme-handler/roblox-studio-auth
Thank you! I didn’t really expect changing DE from Hyprland to KDE temporarily would fix anything but now I am logged in, seems like when I was on Hyprland the login via browser was broken somehow.