Vietnam eV1sa getting denied

Hello,

I am a Bangladeshi citizen living in the USA and need to attend a conference in Vietnam. I have to travel in 2 weeks but my eVisa keeps getting denied.

The first two times it was the passport image, the third time they needed a detailed address, and the last two times I got the message "You are required to complete all the blanks in the application form".

But I already did complete all the blanks. Also, I put all the information correctly. And my friend, a Nigerian citizen, is also facing the same issue. We are going to the same place for the conference.

At this point I didn't know what to do, we tried to call the hotline but nobody answered, we also wrote many emails with no reply.

Does anybody know how to resolve the issue?

Thanks!