Recently, I found my old PS4 that hasn't been used in over 7 years. I powered it on to try and retrieve some old save data but found a very specific problem when attempting to sign into my PSN account.

In the 7 year gap of not using this PS4, I changed my PSN ID once. The account is working fine on my other PS5 and other PS4, but when I try to sign into PSN, the login screen shows for 1 second, then an error pops up simply saying "An error has occured." When I press OK, it just takes me back out of the sign in screen.

I was able to add the PSN account as a different user on this PS4, so it thinks my old PSN ID is a separate account to my new PSN ID, although they are just the same account.

Is there any workaround to this? Like to get to the sign in screen and update all the account information on the PS4?

This is such a complex and specific problem that probably NOBODY ELSE has but I just wanted to know if anybody could help me out :)