If you are trying to access our Author Portal site at it's previous location (authors.springernature.com) then please be aware it has moved to a new URL - www.springernature.com/gp/researchers/sharedit.
Authors of published papers can obtain a SharedIt link (if available) via the above page by entering the DOI of their paper and an email address in the fields provided and confirming they are the author of the article:
