public void setAppInstanceUserArn(String appInstanceUserArn) {
        this.appInstanceUserArn = appInstanceUserArn;
    }
<p>
The ARN of the <code>AppInstanceUser</code>.
</p>

@param appInstanceUserArn
       The ARN of the <code>AppInstanceUser</code>.
aws-java-sdk-chimesdkidentity/src/main/java/com/amazonaws/services/chimesdkidentity/model/DeregisterAppInstanceUserEndpointRequest.java