Glad it's not just me. Thanks for letting me know.
The response trigger has been working for a while. I don't think it's a permission issue because once I force the Qualtrics UI to login to Salesforce, the response mapping stops giving me the invalid login error and starts updating the response object in Salesforce as expected. It seems to just be an issue with the response trigger authenticating to Salesforce when I haven't already done so in the UI.
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