Welcome to JA. Working on a fast accurate answer. Your valuable time is important to me. Clicking on Accept is the right thing for my family and I. This could be several things.
I am hoping a clip came off linkage or you need a slight adjustment in linkage.
If all that is good the range selector switch is where the gear selector post is. and you would want to see if the post will go into reverse gear itself.
If not the shift fork inside needs work and they will need to tear it down probably, But I am hopeing for they Better case scenario for you.