The Content items transferred through a distributed collaboration from ArcGIS Enterprise to ArcGIS Online lose their original thumbnail image size properties, causing issues when trying to share them in ArcGIS Living Atlas, as the required image size is different.
Duplicate of BUG-000143618. Fixed in ArcGIS Enterprise 11.0.
解决办法
This issue is not reproducible in ArcGIS Enterprise 11.0. Use ArcGIS Enterprise 11.0 instead.
Alternatively, re-upload a new thumbnail for the test feature layer from ArcGIS Online and retry nominating the content in ArcGIS Living Atlas. Nominating content works since the thumbnail is of the 600 x 400 pixel dimension.