Filing form 1065 for multiple foreign partners

[JORGE123]

Filing a 1065 where all 4 shareholders are foreigners with no social security number nor applied for one.  Tried to file an electronic extension but system is asking for at least two of the partners to have SS or applied for.   Contacted Proseries for guidance and agent said that because there are no S/H with SS need to file hard copies and not electronically.   When asked what document I need to print to file via regular mail was not able to assist.  Two questions:

1. Have you ever encountered this situation and how did you solve it?

2. If in fact extension needs to be filed with hard copies, does that mean that the actual return also needs to be filed the same way?

Any and all suggestions are welcome as is my first time working with foreigners S/H