Certain challenges I ran into were:

1. Earlier I was not aware that react projects won't be accepted and React was the technology I was currently working with. So I had to switch tracks.
2. Most of my projects were part of tutorials and workshops I undertook in the front-end development domain and even those were not acceptable, so I started working on new projects.
3. I ran into certain issues github issues, for instance some repos not being cloned properly, certain project guidelines not cleared, certain issues being addressed/assigned a bit late. But it got better with time.