I’m having the same issue but with the /auth/forgot-password and /auth/send-email-confirmation in Insomnia.
Seeing that no one has replied to your message since April, perhaps it’s time for me to move on. Strapi is great, but it feels like I spend just as much time troubleshooting these undocumented edge cases as I would with a custom solution. Where Strapi used to save me time, it’s now just slowing me down.