Whenever you can't sign into the netflix password and you feel like the password is incorrect. you can reset that or look at the browser or mail application. because Most of us save the login information in the auto fill settings. In case, if you need more help, you need to follow the instructions.
1. First of all, you need to open the browser.
2. Go to the settings.
3. Click on the autofill settings.
4. Here, you need to check the mail settings.
5. Let's remove the current account and then re-add the mail account.
once you will make these changes, your account will start working fine. for more details, you need to visit: How to find Netflix password on iphone?