The migrate process saves the status of each running migration in the database.  Any error in the code will abnormally terminate the process so the database won't be updated properly and will keep saying that "something is still running".   In Drupal I had a look through the error log and came across the following message: Migration icon_migrate_species_json is busy with another operation: ImportingHowever, this shouldn't be the situation and I had no scripts running.  Now...

For others that have spent countless hours getting this to work and are struggling... in particular assigning the correct user to the comment - this is how I achieved the correct outcome. The outline below is for usage via Postman and DHC (Restlec Client)... once working here then testing done and ready to apply to your app or however you are using this. Set up Set accept to hal+json sample: POST request url: http://example.com/entity/comment?_format=hal_json Authorization Type: Basic {then...