I try to modify the sample from the dev.outlook.com to send emails to selected contacts. Unmodified example works fine, but when I added scope "https://outlook.office.com/mail.write" to oauth.php i receive error.
AADSTS70011: The provided value for the input parameter 'scope' is not valid. The scope openid //outlook.office.com/mail.read //outlook.office.com/mail.write is not valid.
Why it is rejected?
The actual scope you want is https://outlook.office.com/mail.readwrite, and you should replace the https://outlook.office.com/mail.read one with that (since it includes read). You will probably also want https://outlook.office.com/mail.send if you plan on sending mail.