Subscription link not working

Memberships & subscriptions
1

Website link: alt-blog.masaischool.com
When I submit my email for subscription on the website it show

404 Not Found

This is the link I have received in the email
https://alt-blog.masaischool.com/members/?token=JEwhA5nLBczPHvoSTVGx5xZOsRYDCSWH&action=signup

2

Under the admin Settings > Membership > Free tier, do you have a Welcome page input value?