Support has confirmed that an Address record will not be updated under certain conditions.

AUX_ADD_LINE_1 works for uploading Apartment numbers (i.e. Apt 100), but not for other types of data.

AUX_ADD_LINE_2 does not load any data at all unless the database is running TA v5.0.19, which includes AF 2409806.

There are other extra line fields that are working so you can get your data file or control file modified to upload to a different extra line field. Team Approach Support can assist you.