Forgot password
I can't remember my password for my iphone 8plus and I need it to switch over to another iphone.
iPhone 8 Plus, iOS 15
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You can't remember your Apple ID password or you can't remember the passcode for the iPhone 8 Plus?
If you forgot the Apple ID (iCloud) password, enter the Apple (iCloud) ID, and click Forgot Password. See if you can get a Rescue or Notification email option if necessary. Link to contact Apple Support at the end of the 2nd article.
If you have 2 Factor Authentication enabled, if you can't recover the password using the steps above, you will need to use Account Recovery. The Recovery Process is an automated process and the length of time it takes can vary a lot. Apple ID Support can only answer your questions. They can't intervene in or speed up the process. The article below has some suggestions to shorten the time the process takes.
Apple ID - Recover your Apple ID with two-factor authentication account recovery. *
If you have changed your password, have you followed the steps in this article on all devices/computers?
What to do after you change your Apple ID or password - Apple Support. *
Passcode
If you see an option to reset encrypted data, several people have posted that they did that and lost little to no data.