My users are not getting tagged as 'subscribed' on Shopify Customer List

POWR app do not auto-tag users as "subscribed".

App tags users as subscribed only if the app has opt in option in forms and popups. User will be tagged if they check the checkbox: 

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How to make users tagged as "subscribed" on Shopify Customers list?

1. This can be set on POWR editor
2. Choose Content tab
3. Click on Email Address
4. Toggle on Make opt in required.