If you come across the error as seen in the image below, please follow the steps in this article.
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tabs
Windows
Open Chrome console by pressing Ctrl + Shift + i on Windows
Go to Application Tab in Chrome console
Select the "Storage" option from the sidebar
Click on "Clear Site Data"
Go back to Neo Mail web page and refresh the page
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Mac OS
Launch Chrome Developer Tools by pressing Option + Command + I
Go to Application Tab in the Developer Tools
Select the Storage option from the sidebar
Click on Clear Site Data
Go back to the Neo Mail web page and refresh the page
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Hope this article was helpful to you and if you still need any further assistance, please feel free to reach out to us at hello@neo.space and we shall be very happy to help :)