US Immigration from Cuba

We recently received a letter via email from embassy stating our case was "refused and denied" under section 221G and are requiring a second interview along with un updated DS160 , new medical and back ground check.

The wording is confusing as it says we were refused and denied but are giving us a second interview.

I know every case is different but What should we expect on the second interview. Our case was put under AP and never requested any documents afterwards.

The letter is only asking for three things but wondering if we should prepare for a full interview, like take proof of relationship, an updated affidavit support, should I the petitioner attend??

How high are our possibilities to get approve this time?

Beneficiary COUNTRY: CUBA

U.S. EMBESSAY in Guyana

Interview: September 2019

K-1 visa

First interview put on AP

Hello,

So my fiancee and I are working on getting all the appropriate documents in order to submit our application hopefully in early December. We wanted to get the application submitted earlier but have not been able to see each other since March of 2020 due to COVID-19. So i know per the requirements i have to submit 2 Passport pictures the question is since i will also be adding her son as a K2 to the application do i have to submit passport photos for him as well.

Also any other tips would be greatly appreciated i just want to make sure i have more documentation than actually needed.