There are several reasons when a member gets redirected to the aiesec.org when he/she try logging into EXPA.
There are few reasons why a person gets redirected to YOP.aiesec.org :
1. Please check if the email ID which the person is using to log in is the login email ID (the email ID to which the member has been assigned a position on EXPA).
2. Please check if the member has an active role on EXPA. If not, then assign a role and then try logging in again.
Please note, only the EB can assign roles on EXPA.
If in case you feel a difficulty in logging in even after both the above conditions being satisfied, feel free to contact the EXPA support team. Write us at firstname.lastname@example.org for any queries.