I think you need to tick the "Export for Sharing" button on the export box:
When you import, you'll be prompted to select the datasource.
In the meantime if anyone is wanting to give this a try, just open the json file with a text editor and find and replace all instances of "PC98BA2F4D77E1A42" with "TeslaMate" (note the upper case M)
You can then paste the json into the import screen. Remember to refresh the dashboard to populate the panels.
When you import, you'll be prompted to select the datasource.
In the meantime if anyone is wanting to give this a try, just open the json file with a text editor and find and replace all instances of "PC98BA2F4D77E1A42" with "TeslaMate" (note the upper case M)
You can then paste the json into the import screen. Remember to refresh the dashboard to populate the panels.