We do not currently provide a step-by-step guide specifically for the DUO Access Gateway identity provider.

However, you can check out their guide for setting up a SAML application: https://duo.com/docs/dag-generic#add-your-cloud-application-to-duo-access-gateway

On the Atlassian product end, open the "Manage add-ons" page and make sure our SAML SSO app is installed. Then click "Configure" on our SAML SSO app.

If you already have an existing configuration add a new identity provider, otherwise the wizard will open automatically.

All the values you will need during the setup of your identity provider will be provided to you in the wizard of our app.

If you have any problems setting up the identity provider with our app, do not hesitate to contact our support or book a screen sharing session.