There is a small error in your get_bbox_from_shape function: shape is already a shapely geometry, and as such, has no attribute geometry (this is what the first error says: AttributeError: ‘Polygon’ object has no attribute ‘geometry’)
Changing the line
minx, miny, maxx, maxy = shape.geometry.total_bounds
to
minx, miny, maxx, maxy = shape.bounds
works.
Beware that your code works correctly only for geometries that are in WGS84 coordinate reference system.
Your second approach is also possible, and has an error due to imports… If you do
from sentinelhub import BBox, CRS, Geometry
you can create bounding boxes from your geometries as
bbox = Geometry(shape, CRS.WGS84).bbox
(shape would be i in your for loop).