My apple ID is associated with a comcast.net address which I haven't had access to for many years. Now suddenly it won't let me sign in to iCloud, error is "unexpected error occurred?.

Hello moox23,

Thanks for checking. In that case, we can't help here in the public setting.

For your privacy and account security, please contact account support: Get Support

They will verify you are the owner of the account, and check all options to fix this.

Thanks.

Hi there moox23,

To confirm, are you able to sign into the Apple ID website? If yes, then you should be prompted for a verification code after typing in the new email address you want to change your Apple ID too. The steps below go through how to do that. Please let us know if you are getting stuck on a certain step in the steps below.

How to change your Apple ID to a different email address

1. Go to appleid.apple.com and sign in.

2. In the Sign-In and Security section, choose Apple ID.

3. Enter the email address that you want to use as your Apple ID.

4. Choose Change Apple ID.

5. If you changed your Apple ID to a third-party email address, check your email for a verification code, then enter the code. Learn what to do if you didn't get the email.

6. If you use services like iCloud or Messages to share with friends and colleagues, sign in to those services with your updated Apple ID.

Those steps are from this article: Change your Apple ID - Apple Support

Take care.