Hello QuantumJourney,
After reviewing your post, it sounds like you need to use a different Apple ID in the iCloud Preferences. I would recommend that you read this article, it may be able to help the issue.
What to do after you change your Apple ID email address or password - Apple Support
Choose Apple menu > System Preferences, then click iCloud.
If you're signed in with your previous Apple ID:
- Click Sign Out. Depending on what iCloud options are turned on, you'll be asked if you want to make copies or delete iCloud data (Contacts, Calendar, Reminders, Bookmarks, Photo Stream) from your Mac. Your data will remain in iCloud and will be updated on your device when you sign in to iCloud again.
- Enter your updated Apple ID or password to sign in.
Thanks for using Apple Support Communities.
Have a nice day,
Mario