Nintex Forms for Office 365 App Error: User Access Token Redemption Failed For Site Using App With Host Name formso365.nintex.com

Document created by butlerj Support on Dec 19, 2018
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ISSUE
When attempting to access the Nintex Forms for Office 365 app, the app errors with the message: "User access token redemption failed for site https://SiteURL/ using app with host name formso365.nintex.com 400 (BadRequest) response received from OAuth endpoint."
ERROR CODE
User access token redemption failed for site https://SiteURL/ using app with host name formso365.nintex.com 400 (BadRequest) response received from OAuth endpoint.
RESOLUTION
White-list *.nintex.com within the firewall that does 'Man in the Middle' encryption/decryption for the corporate network.
ADDITIONAL INFORMATION
This can also result in the Nintex Workflow for Office 365 app hanging on "Connecting to Site."
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