Hi @Zoe_H, Further to the above thread, I am experiencing this same (or at least similar) issue. When I use your API via our website to add the contact, I get a similar message as mentioned above - "Email address ****.*.******@gmail.com already exists.". This error message is generated by your API and not something that we validate or control. However, when I search for that email address in the Constant Contact admin UI, it does not appear under the "All subscribers" list or within any of the filtered lists (e.g. Unsubscribed, Awaiting confirmation, etc.). I have been able to get around it by manually creating it as a new contact within the Constant Contact admin UI as you have described above but obviously I wouldn't expect this to be possible if it did actually already exist. To confirm that this was an issue and not a random blip/fluke, I did a test whereby I subscribed to our mailing list using your API on our website with a brand new email address that did not exist in any of our lists. I then visited the Constant Contact admin UI and searched for the new email and found it there. I then proceeded to delete that email contact (not unsubscribed, just deleted) and searched for it again, and confirmed that I could not find it in any lists. I then re-visited our website and tried to re-subscribe the same email address using your API via our website and was shown the same error message mentioned above, suggesting that the email address was already subscribed, which was not the case... As mentioned above, I don't require a solution as I am able to manually add the email address via the CC admin UI, but would appreciate if your development team could investigate and confirm the issue. Cheers John
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