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You can get the street line like below : $order->getBillingAddress()->getStreet(1); $order->getBillingAddress()->getStreet(2);.
edit: the code above is to get the billing address of an order, what I think you want now is actually the new address, the data set in the form.
Another angle on this, can you post your form code? (the elements specifically? are you using the default templates? (ignore above if you are).
To get Customer address street second line details from magento 2
Below code snippet will helpful to retrive the shipping address information in magento 2. Using object manager here am getting store details. We ...
“Address Line 2” form fields — where users add an apartment number,
Zip/Postal Code, {{config path=”general/store_information/postcode”}}
In Magento 2 we can get Customer billing and Shipping address by order id using below code snippet, Sometimes we required billing or ...
Magento 2 :- Number of Lines in a Street Address not setting to default