When we left for home in November, JB emailed a link for us for the attestation form, which is required to board the plane. I had a small problem with it going through, until I noticed it wanted my house number, and street address on 2 different lines. So, problem solved for us.
On the day of departure, it seems many folks did not get the email or hadn't seen it. They had 1 JB employee at the line for check in to make sure everyone had filled it out. Those that hadn't were having trouble connecting to the wifi to do so. Lots of unhappy people and lots of delays in the line moving forward.