About campaign codes
A campaign code is the globally unique identifier for a campaign. Each campaign must have a code, and no two campaign codes in the same Campaign partition can be the same.
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When users create a campaign, the Campaign Code field is automatically populated with a unique value from the code generator.
Users can click Regenerate code to have the code generator supply a new identifier, or they can enter a code manually. If users manually enter a code, it must be unique and in the specified format.