ERROR: code:500, Service Hosted/<map service name>/MapServer not found , Internal server error

Error Message

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.

Cause

The following are possible causes:

• ArcGIS Data Store is not validated with ArcGIS Server.
• The relational data store is in read-only mode. This happens when the available disk space is less than 1024 MB.

Solution or Workaround

Use any of the following solutions depending on the cause:

Validate ArcGIS Data Store

Set ArcGIS Data Store to read-write mode

1. Increase the disk space of the ArcGIS Data Store machine. Refer to ArcGIS Enterprise: Disk space requirements for more information.
2. Change the relational data store from read-only to read-write mode. Refer to the solution section of this article, Error: Failed to create new feature(s). General Function Failure [database error has occured.] for more information.