Error to make a Transactional API (email and Sms)

I’m trying to do a Transactional message by e-mail, but i’m having problems because, shows the following answer :
“message”: “MCMS_UTM_Authorization_InsufficientPrivileges: Insufficient privileges to complete this action.”,
“errorcode”: 20002,
I went to Marketing cloud and enabled all scopes possible, but still giving me this error, what can it be ? thanks