Your email confirmation link’s domain is in common adblock lists.

Thanks for that info. I am currently using brevo.com and the dashboard says that over 98% of mails were delivered. I already started to register Amazon SES, currently waiting for the DKIM verification. So seems like a good time to switch soon. I hope that helps, since smtp servers and email domain warmup is not really a topic I know much about honestly.

Update: Will add SSO soon

Not the email, the link in it is blocked by ad blockers. You might want to check the number of emails sent versus the number confirmed.

Oh, okay. Which ad blocker are you using? I am using ublock origin and didn't notice that issue. I will take a look. Thanks