Contact sharing rules do not grant Users access to Contacts as expected

This issue occurs because Contact sharing rules are only applied when Contacts have their own independent sharing model. Follow the steps below to diagnose and resolve the issue.

Check Organization-Wide Sharing Defaults for Contacts

Navigate to Sharing Settings in Setup to verify the current OWD for Contacts:
In Salesforce Classic: Setup > Security Controls > Sharing Settings
In Lightning Experience: Gear icon > Setup > Security > Sharing Settings

Understanding "Controlled by Parent" Behavior

When Contact sharing is set to Controlled by Parent, Contact access is determined by access to the related Account record — not by Contact sharing rules. This means:

• Contact sharing rules are not applied, even if they are configured.
• Contacts cannot be shared independently from their parent Account.
• A Contact that is not linked to an Account is always private, regardless of Organization-Wide Defaults. Only the record owner and administrators can view it.

Resolution Options

To resolve this, choose one of the following approaches:

1. Create an Account sharing rule to share the Accounts related to the Contacts. This grants users access to the associated Contacts through the parent Account. See Create Sharing Rules for instructions.
2. Change the Organization-Wide Default for Contacts to a value other than "Controlled by Parent" (for example, Private or Public Read-Only). This allows Contact sharing rules to take effect. Note: Only System Administrators can change Organization-Wide Defaults.

Important Notes:

• Changes to Organization-Wide Defaults can only be made by System Administrators.
• A Contact not linked to an Account is always private regardless of OWD settings.