To authorize Qualtrics to send emails on your behalf you will have to include it in your SPF record. The SPF record mechanism used for Qualtrics is shown below.
For more information on how to set up SPF for Qualtrics please click on the button below.
Qualtrics support DKIM signing and you will have to reach out to their support team to enable it for you.
Create a free OnDMARC account to test your configuration.