.set() is not working for brightness and exposure on Macbook

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Hi, I m using opencv 4.1.2 and Macbook to set camera properties but continously getting False in response for brightness and exposure while height and width are fine. Macbook OpenCV 4.1.2 Logitech Brio 4K

import cv2
import time
cap = cv2.VideoCapture(1,cv2.CAP_AVFOUNDATION)
r=cap.set(3,1920) 
print(r)
r=cap.set(4,1080)
print(r)
time.sleep(2)
r1=cap.set(cv2.CAP_PROP_AUTO_EXPOSURE, 0)
r=cap.set(cv2.CAP_PROP_EXPOSURE, -7)
print(r1)
print(r)
r=cap.set(cv2.CAP_PROP_BRIGHTNESS,1.0)
print(r)
print(cap.get(cv2.CAP_PROP_BRIGHTNESS))
ret, img = cap.read()
img1="1.jpg"
cv2.imwrite(img1, img)
#cv2.imshow(img)
cap.release()

Response

True
True
False
False
False
0.0