Login into your Azure admin and create a new app
On the next screen Select "Set up single sign on"
Next upload the Metadata file. You can download it from here
Parameter should be pre-filled from that file:
Next we need to configure what field is mappend to the SAML NameID-attribute. This is the username in the Atlatos-System. Go to "attributes & claims" and configure as needed.
Confirm and save the settings.
Afterwards you can find a download link under "SAML Certificates" for the "Federation Metadata XML" that you can download and send to your contact at Atlatos.