How to share PSN account

I just recently bought Star Wars: Squadrons for my PS4. I also bought a copy for my best friend so we can play together. However, the primary account is shared between me and my family, and I want to use my personal account to be my screen-tag. I looked up different ways to share the PSN account, and I followed the instructions. However, when I go to log in to the network to use all the features, it says something to the effect of "another user is logged into the account."

Anybody have any idea how to make this thing work?