This guide will let you know how to fix the PS4 error code WS-43689-0 due to playstation plus subscription. You will not find it there if you try to look for it on the PlayStation support site, either.
To solve this issue, you first have to restart your PS4 and then wait for a while. You have to renew your PlayStation Plus to solve the issue.
If this method doesn’t work, you have to purchase it from an online store or use your phone to purchase it. Then get it connected to your account, and also you can purchase the code online. Then redeem the code, and you will get PlayStation plus, as shown in the image below.