for Different Cross Sections (Multiple Sectrions) along a Sweep the path must be Tangent Continous, what is not given for Your path.
So is it possible to create a filled for the corner or should it be as drawn?
A sharp edge within the path only is possible for a single constant section
PS.: for Sweeping feature only one closed profile is allowed so You can not create the wall thickness in one step together with the sweep.
But I have seen, that You have a constant wall thickness of 4.5mm so just create a Thinwall Feature afterwards!