When you sync your Google account with LionDesk you may encounter a 400 Error message, please note this error is not from LionDesk - it is from the web browser.
If you encounter the 404 error - remove "https://"
Make sure www.liondesk.com is in the URL bar without the https://
Note: If by chance, you experience this issue while using the SSO(Single Sign on) Through CRMLS, RealComp or possibly another MLS or service. Please attempt to Login through LionDesk by going to LionDesk.com and signing in this way. Please Also reset your password if you do not know it, your username/email should be the email you used for Login through your MLS.