Proving authorship when name in publications does not match name in passport My full name on passport is Amir Hisham Ahmed Al-Attraqchi (first three names + surname). In my publication, I only used the first and the surname (i.e. Amir Al-Attraqchi). Is it going to be a problem proving the publications to be mine?

I'm worried about proving this when applying for new universities, promotions or fellowships
Arguably, you did the right thing.

In my experience, too many names tend to confuse people. I have 2+2 and I saw my name being cited in lots of different ways, without any consistency.

One thing that really helps to prove that you are the same person is to set up an ORCID and use it in the publications.