Reset iCloud password on iPhone successfully. I’m getting unknown error when using it on my iMac. Any ideas? Thank you.

See If you can't connect to the App Store, iTunes Store, or other Apple services https://support.apple.com/en-us/HT201400. There have been quite a few Apple server connection problems lately. Among other things, in the above document, see Check Apple’s System Status page. You can check there to see if the needed server is available when you need to use one.

Also, below are the alert messages given in the document. But, receiving others is a possibility. Use the steps in the above document if you see one of these error messages or a somewhat similar message. Given the message you received, see the first one especially.

·      "Cannot connect to the iTunes Store. An unknown error has occurred."

·      "We could not complete your iTunes Store request. The iTunes Store is temporarily unavailable. Please try again later."

·      "Could not connect to the iTunes Store. Make sure your network connection is active and try again."

·      "We could not complete your iTunes Store request. The network connection could not be established. There was an error in the iTunes Store. Please try again later."

Also, if you want to contact Apple Support for help with your problem, see:

Get a call from Apple support to help solve your problem using this link https://getsupport.apple.com/?caller=kbase&PGF=PGF63005&category_id=SC0245&symptom_id=23362

Apple ID Support https://support.apple.com/apple-id

Apple Support Twitter https://twitter.com/AppleSupport There may be an hour or so wait.

Apple ID account security for country-specific and region-specific help https://support.apple.com/en-us/HT204169

Get Support: We’re here to help https://getsupport.apple.com/. Go through the options to find the best one for you.

If you have changed your ID or password, have you followed the steps in this article?

What to do after you change your Apple ID or password - Apple Support.