To change the User Account Mapping field:
1. In Salesforce Setup, navigate to Slack | Manage Slack Connection.
2. Click 'Disconnect' and confirm.
3. Click 'Connect to Slack' to start a new connection.
4. During setup, select your desired User Account Mapping field (Email, Federation ID, or Username).
5. Complete the connection process.
Slack Help: Connect Salesforce and Slack
005232811

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