Mailchimp DKIM and SPF records added, but subscribe invifations are still going to spam

I am attempting to allow mailchimp to set the from email on my campaigns to an account that I setup on my mailinabox server for my company. I have added the DKIM CNAME record and the SPF text record, however, when a user requests to sign up from my website, the confirmation email goes to spam, stating that:

It has a from address in my.domain but has failed my.domain’s required tests for authentication.

I have tried adding postfix options, but nothing seems to work. Messages still go to spam. How can I allow mailchimp to send out emails using a specific user in MiaB?

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