Known Issue: Redirect URI error when browsing to the K2 Appit for SharePoint Application Page
KB001868
PRODUCT
Summary
When accessing the K2 Appit for SharePoint application page using the SharePoint Online page layout view, the following error occurs:
Cause
The new SharePoint Online page layout does not parse in the correct parameter value for the host URL on redirect. Notice the {HostUrl} placeholder in the URL below:
".../sites/AppCat/K2AppitforSharePoint/Pages/Settings.aspx?SPSiteURL={HostUrl}&tsapp=1"
This is a SharePoint Online issue.
Workaround
Revert to Classic page layout view as described in SharePoint Online User Interface changes.