M365 Graph connect as a incoming and outgoing email servers

M365 Graph connect as a incoming and outgoing email servers

I am using Free version (up to 10 technician) and I want to integrate incoming and outgoing servers with M365, I tried with myself but I am stuck. can someone help me? at the end of sign in, I see attached screenshot message. 

I followed this link but it seems it's older version (0auth is not supported anymore) 

                  New to ADSelfService Plus?