There are 3 ways to reset the second factor for individual users:

Java-Command

To do this, the SparkView service must first be stopped. Then use the following command in the SparkView root directory:
sudo java -cp SparkGateway.jar com.toremote.gateway.tool.TwoFactor username

For AD users, please use the following command:
sudo java -cp SparkGateway.jar com.toremote.gateway.tool.TwoFactor "domain\user.name"

cURL-Request

The SparkView service must be running for this. Then please use the following command:
curl -k -G --data-urlencode "target=twofa" --data-urlencode "user=username" http://sparkview-server.com/CONTROL

For AD users, please use the following command:
curl -k -G --data-urlencode "target=twofa" --data-urlencode "user=domain\user.name" http://sparkview-server.com/CONTROL

HTTP request (API)

The SparkView service must be running and a hashed management password must be used. Then please call up the following URL:
http://sparkview-server.com/CONTROL?target=twofa&user=username&gatewayPwd=21232f297a57a5a743894a0e4a801fc3