Unable to Add Family Member to Custom Email Domain

Hi guys,

I am the owner of a verified custom email domain in iCloud+ and I am trying to assign an email address from this domain to a family member. I have checked the following below:

• My domain is active and verified in iCloud.com. I checked on my mail and Cloudflare. I created mail for me as owner with the custom domain and works ok for sending and receiving.
• The family member is part of my Apple Family Sharing group and has iCloud Mail enabled. It is for my wife. I setup redirect in Cloudflare and it works fine for receiving, but not for sending. For example, I can send to her new mail with custom domain from iCloud or my custom domain mail, and she will receive it. But if try to send, in the From field, I cannot make it work. Tried to enter the new mail with custom domain on her iPhone in the iCloud+ options, I get to the place [name]@customdomain.org, and it shows the error:

“Something went wrong. Try again later.”

I have attempted to remove and re-add the family member, but the error persists.

Could you please assist in enabling this family member to use a custom email address from my domain?

Thank you for your help,

Milorad.