In Outlook, if someone forwards to you an email/email conversation in which you didn't take part, you cannot see information through Microsoft Graph on the older emails, instead, you only get this email when you ask for every emails of the conversation.
It is particularly weird since as the email is forwarded to you, you have access to all informations in the body...
I have tried with Mail.Read and Mail.Read.Shared and none of them seems to be enough permission to see it. I don't know if there is currently a way to get these emails, please advise.