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When attempting to register the K2 for SharePoint app, we receive the following error at the last step (K2 Application).
"Thread 1: The remote server returned an error: (403) Forbidden."
SharePoint environment is not fully configured to support HTTP.
On the SharePoint front-ends, please run these SharePoint PowerShell commands and retry the activation.
# Dev Only - Disable HTTPS requirement on SharePoint
$stsc = Get-SPSecurityTokenServiceConfig
$stsc.AllowMetadataOverHttp = $true