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Q. Even when I click on "here", and "Allow Local data to be set" in Settings, the message continued to appear. 

A. Browsers can override some settings, but for security reasons cannot override "Block third-party cookies" setting. Changing this setting requires manual reset. 

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In Chrome, access the Settings section

• Select “Advanced”
• Select “Content Settings”
• Select “Cookies”
• Set “Allow sites to save and read cookie data“ to On and
• Set “Block third-party cookies” to Off
• You can now log in to the ActivePDF Support portal

See attached for detail instructions.

Alternatively, please try clearing your cache and cookies and try to sign in again.
https://support.zendesk.com/hc/en-us/articles/1260807002549-Invalid-Authenticity-Token-error