Are you using Double or Single Optin within MailChimp?
You can check that inside MailChimp ? Lists ? “Your Listname” ? Settings ? List Name and Defaults ? Enable Double Optin
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If you use Double Optin you have to set your “Signup Thank You Page” to the url of your “Viral Coming Soon” Confirmation Page.
The URL of your confirmation page is simply the domain where you are running the Plugin + “?confirm=1”. So for example https://www.example.org/?confirm=1
You than copy and paste that URL within MailChimp ? Lists ? “Your Listname” ? Signup Forms ? Form Builder and choose “Signup Thank You Page” from the Dropdown Menu. When you scroll down you can paste in the URL to your Confirmation Page:
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The same is true for your “Thank You Page”. To set that one you have to change the “Confirmation thank you page” within MailChimp to the url of your “Viral Coming Soon” thank you page. You can copy the URL of your thank you page from within the Viral Coming Soon Plugin Settings ? Thank You Page:
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Than you go to MailChimp ? Lists ? “Your Listname” ? Signup Forms ? Form Builder and choose “Confirmation Thank You Page” from the Dropdown Menu. When you scroll down you can paste in the URL to your Thank You Page:
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This is just the way how MailChimp handles it,
hope this helps,
best regards