How to suggest to users that they may need to change one of their email addresses from the default?

As part of account management users can set their Primary email, as well as the email used for other services (Google & Apple). These are required for the system to work.

For many users these will be identical, but others will have different emails for each. Currently all 3 default to the email registered with. The email change form is on an account management page with 3-4 other similar mini-forms.

The descriptive text changes on dropdown change, the action button only enables when both fields are filled in correctly, and the email field has a placeholder of the current value.

Default view: enter image description here

Dropdown arrow pressed: enter image description here

Another option selected: enter image description here

The current system seems pretty straightforward to me, but user feedback suggested it was confusing, and didn't make it clear that other email addresses could be configured.

Initial ideas were some sort of "have you checked your other email addresses?" reminder, but I'd rather design it obviously enough that the users know they may need to change emails without explicit guidance.

Advice very much appreciated!

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