Welcome to EpiUsers @remyk !
Check this: Excel Parameter To Filter Epicor BAQ - #25 by CSmith
and this: Using Excel to Pull Data With REST and Multiple BAQs - #19 by NateS
These should help with access to the OData feed using excel and the Power M Query needed to access your data properly. If you need more information beyond those we will try to assist, but more details like API v1/v2 access? Can you access the swagger help area(s) using the same Epicor Login?
V1: https://{SERVER}/{INSTANCE}/api/help/v1/
V2: https://{SERVER}/{INSTANCE}/api/help/v2/