Open Safari on your MacBook Air
Click Safari in the menu bar
Select Settings
Click the Privacy tab
Uncheck Block all cookies if it is enabled
Close the Settings window
Open Google Chrome
Click the three dots in the top-right corner
Select Settings
Click Privacy and security
Click Third-party cookies
Choose Allow third-party cookies or a suitable allowed option
Open Firefox
Click the three-line menu
Select Settings
Click Privacy & Security
Under Enhanced Tracking Protection, choose Standard or Custom
Make sure cookies are not blocked in the Custom settings
Restart the browser if needed
Reload the website you want to use