Passenger side front drive axle installation issue

Hello, I'm Danny.

Have you verified/are you sure you have the correct size/length replacement axle?You might want to take the old and new axle and perform a comparison seeing if both ends are the same length. Here is a tutorial showing how to replace the axle:

https://www.2carpros.com/articles/replace-cv-axle

Also, If you see they are actually they are the same I usually try using a a deadblow/Rubber mallet and tap on the outer end to help seat the axle. I've attached a picture below of other instructions. Hope this helps and thanks for using 2CarPros.
Danny-