If you are experiencing issue when logging into your Simplified's Chrome Extension, make sure that your'e logged into Simplified, and that you have the right settings on Chrome.
Follow these steps:
Simplified Log In
Check if you're logged into your Simplified app. If you're not, log in.
Chrome Settings:
Go to Google Chrome's third party cookie settings (or click here). Make sure you have the “Allow third-party cookies” option selected.
Go to Google Chrome's flag settings (or click here). Make sure you have the “Experimental third-party storage partitioning.” option disabled.