Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hi Corey Riley 76,
Sorry to get back to you late.
I have just heard from our related team and we recommend you safely ignore the error since the affected user has been migrated successfully and you've verified that the proxy address only exists on one object. Just feel free to let us know if there is any side effect of this error in the future. Thanks for your time and cooperation.
Regards,
Sam