Confirm the object is marked as deployed and not in development is what the administrator should do to resolve the issue. A custom object can be marked as deployed or in development depending on its readiness for use. A custom object that is marked as in development is not visible to users or available for data import or export. A custom object that is marked as deployed is visible to users and available for data import or export. Therefore, the administrator should make sure that the new custom object is marked as deployed before using Data Loader to upload records to it

A lookup relationship with Read/Write sharing setting is the recommended option to use when adding a field to Case Outcome custom object. A lookup relationship is a type of relationship that links two objects together and allows users to associate one record with another. A lookup relationship does not affect the security or deletion of either record and can be optional or required. In this case, you can create a lookup relationship field on Case Outcome object that references Case object and allows users to link multiple Case records to multiple Case Outcome records. You can also set the sharing setting for the lookup field to Read/Write, which means that users who have access to the parent record can also access and edit the child record. References:
https://help.salesforce.com/s/articleView?id=sf.relationships_lookup.htm&type=5 https://help.salesforce.com
/s/articleView?id=sf.relationships_considerations_lookup.htm&type=5

To manage both B2C and B2B customers, CK should use Person Accounts and Contacts to Multiple Accounts features. Person Accounts allow CK to store information about individual consumers without requiring a separate account record. Contacts to Multiple Accounts allow CK to associate a contact with multiple accounts, such as their employer and their personal account. References: https://help.salesforce.com/s
/articleView?id=sf.account_person_behavior.htm&type=5 https://help.salesforce.com/s/articleView?id=sf.
account_contact_rel_overview.htm&type=5

An authentication app is a mobile app that generates verification codes for logging in to Salesforce or other services that require multi-factor authentication (MFA). A username and password are also required for logging in to Salesforce, but they are not sufficient for MFA. References: https://help.salesforce.com/s
/articleView?id=sf.identity_auth_apps.htm&type=5

Another quote is already synced with the opportunity will prevent a user from syncing a quote with an opportunity. Only one quote can be synced with an opportunity at a time. If a user tries to sync another quote, they will get an error message saying that the opportunity already has a synced quote. References: https://help.
salesforce.com/s/articleView?id=sf.quotes_syncing.htm&type=5