As a Dynamics 365 Business Central user who maintains a BC Sandbox, you may occasionally wish to connect your Jet Reports to your Sandbox tenant instead of your live Business Central data.
You can see below that the standard sandbox tenant is just the normal GUID with /Sandbox appended to the end
In your Jet Reports Data Source Settings, go to the Web Service tab and add /Sandbox to the end of the Instance setting:
Your data source will now access your Sandbox, rather than your live Business Central data.
Simply remove the /Sandbox from your Instance setting to revert your data source to accessing your live BC data.