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• Have your IdP configured correctly for Sectigo. See below under "SAML Configuration".
• Edit your organization object (use the pencil icon when the Organization card is shown) and set "Academic code (SCHAC Home Organization)" to the same value as your IdP sends for schacHomeOrganizationfor schacHomeOrganization. It will typically be your main domain, but confirm this with your IdP admins. If you cannot edit this yourselves, contact tcs@sunet.se and tell us what to enter.
  

For it to work for your users who need IGTF/grid certificates, you also need to:

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