The Mailchimp Email SignUp app is no longer supported which is causing the issue.
Please try to create a Popup app instead using one of the links below and see if that makes any difference on your end.
https://www.powr.io/plugins/popup / https://apps.shopify.com/powr-popup
And connect to Mailchimp:
Connect Popup to any app using Zapier
Mailchimp is not linking with my Mailchimp Email SignUp app - Shopify
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