Hi r_mdx,
Welcome to the Community Forum!
Thanks for posting. If you're experiencing issues with bounced back emails, it might be due to a full email storage. Try deleting some emails, particularly from your sent and received boxes. Once you've cleared some space, try resending the change of details form. This should hopefully resolve the issue.
Feel free to post again anytime you require further assistance.
If my response has answered your enquiry, please click "Accept as Solution" to assist other users find this.
Kind regards,
Shella
