I can't put my friend's PS4 account as principal on my PS4

I want to add as principal account my friend's account in order to share games and PS plus, but when I try to make him as principal the system tells me that I have already a PS4 account set as principal, but it's not true.

I've already tried to remove all the accounts that I have in the PS4 but it still doesen't work.

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How do I force my PS4 to activate as primary?

The PS4\u2122 system you use to sign in to PlayStation\u2122Network for the first time is automatically activated as your primary PS4\u2122 system. To activate your system after you first sign in, select (Settings) > [Account Management] > [Activate as Your Primary PS4] > [Activate].

Can two accounts have same PS4 as primary?

Unfortunately, if you have more than one PS4 or PS5, you'll need another account with PS Plus for each extra console you have. That's because benefits can only be shared from the primary account to other accounts on the same console, and there can only be one primary account per console.

How do I change ownership of my PS4 account?

PlayStation 4:

Step 1: From your PS4 go to [Settings].

Step 2: Select [Account Management] > [Account Information] > [Profile] > [Online ID].

Step 3: Enter an Online ID of your choice or choose from one of the suggestions.

Step 4: Follow the on-screen prompts to complete the change.

Nas - I Can (Official HD Video)

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Lucie Liz, EVG Kowalievska, Vitaly Vlasov, JÉSHOOTS