The upcoming refresh (click here) for the NetDocuments Service will include support for the SameSite attribute required by Chrome v.80. The implemented attribute will be SameSite=none; secure. Administrators need to be aware that older versions of Chrome (v.66 and earlier) reject cookies where SameSite=None is present. This means that any applications which uses iFrames for NetDocuments with Chrome 66 (or earlier) embedded browser, will not be able to authenticate. The browser will need to be updated to support SameSite attributes.
Below is some additional information: