fixing the icloud+ custom domains error this email is already in use with another apple id


I tried Apple’s custom domain with iCloud Mail feature, part of the iCloud+ offering.

Adding my domain in there worked flawlessly. When I added my e-mail address in there, however, I received the error “This email is already in use with another Apple ID”.

Apparently, I had registered an Apple ID in the past with my e-mail address and forgot about it. A quick search revealed that the issue is not easy to fix, but I managed to fix it. Here is how:

Now you can add your e-mail address and enjoy this new iCloud+ service.

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