Fortinet Radius authentication using Azure AD

It's easier when you ask the question explicitly. :)

If I can do a bit of telepathy: Basic Azure AD/Entra ID do not support RADIUS protocol for authentication, only SAML. To integrate via LDAP and/or RADIUS, you'd need Azure AD Domain Services / Entra Domain Services, which (as far as I understand) is essentially a domain controller in the cloud, which exposes LDAP for "legacy" integration.