Hi,
I believe you should check if this user is assigned to an organization which has correct address asisgnment.
The following tables will contain the corresponding information:
BUT020--BP of org and address number of org
ADCP--personal number of user(BUT000) and you will see the connected address number for org (C)
ADRC--address details table, and you may use address number to check if all the information are maintained.
BR,
Ivy