Attempting to publish a web map with copied data from ArcGIS Pro to Portal for ArcGIS fails, and the following error message is returned:
Error: ERROR: code:500, Service Hosted/<map service name>/MapServer not found , Internal server error.
The following are possible causes:
Use any of the following solutions depending on the cause:
Validate ArcGIS Data StoreRefer to How To: Validate ArcGIS Data Store for steps to do this.
Set ArcGIS Data Store to read-write mode