I assume you are using the host page and cookie authenication. using azure ad support is not built into IIS. You will need to pick one of the azure ad auto-signin solutions. Microsoft keeps changing their SSO offerings. Best to check with account rep.
use edge ad support:
https://learn.microsoft.com/en-us/deployedge/microsoft-edge-security-identity
install azure ad sso on the devices
https://learn.microsoft.com/en-us/azure/active-directory/hybrid/connect/how-to-connect-sso
you can also use azure app SAML proxy