2- It may be due to the Witwiser Chrome plugin. If the Witwiser Chrome plug-in was installed and deleted before starting the test, the exam page needs to be refreshed with ctrl + shift + R before starting the test.
Is your problem continue? If you are using Mac OS, please visit Screen Sharing Problem / Mac OS
3- If you click somewhere while the screen sharing pop-up is opening, screen sharing pop-up can move to the background. Please check the background and return it foreground. Then please approve for screen sharing.
Screen sharing verification is overrunning and screen sharing can not be able to perform.