Specific mail client doesn't appear in members list

One of my client subbed to my blog here https://plezna.com/#subscribe through his protonmail e-mail id. He received the confirmation mail, clicked on it and got subbed, however his email doesn’t show up in my members list of ghost admin dashboard.

Hi there, your site doesn’t appear to be loading.

Your site needs to be online to receive webhooks from Stripe - maybe this is the issue?

Thanks @Hannah for your response. Will look into it. I am not sure what wrong I have done but my site is down :frowning: I am debugging