Your website must set
SECURE_HSTS_PRELOAD in order to be submitted to Chrome's list of sites that are hardcoded as being HTTPS only.
preload to the HSTS header when
SECURE_HSTS_PRELOAD = True to facilitate this.
Browsers that use the HSTS preload list will perform HTTPS requests without your website first returning a response with a HSTS header.
If we spot this issue in your GitHub pull request we give this advice:
Django Doctor will run this check by default. No configuration is needed but the check can be turned on/off using check code
missing-hsts-preload in your pyproject.toml file.