What Is PSN Friends List?
How to Check PlayStation Friends List on PC?
It is easy to check your PSN friends list online.

Then, you will be redirected to the profile page.
There in the right section under theFriendstitle, you’ve got the option to see all your friends.
How to Check PSN Friends List on Mobile Devices?

How to Check PSN Friends List on Cell Phones?
In such situations, you have to rely on the PlayStation App.
Just download and install it from Google Play or Apple Store.

Next, sign in your online ID (PSN account).
Then, tap the Friends icon on the top right to see your friends list.
How to Check PSN Friends List on PlayStation Console?

Similarly, sign in to your PSN account on your machine, PS4, orPS5.
Then, pick the Friends icon on the lower menu.
My PSN friends list disappeared!
someone complains that his friends not showing up.
However, this seems to be a server-side problem instead of a local error.