Summer ’21 is coming with lots of new features.
The sandbox preview window for Summer ’21 begins May 7, 2021. We must have an active sandbox on a preview instance by May 6, 2021 (the day before sandbox preview) to take advantage of the preview.
How does Sandbox Preview work?
The sandbox preview is a 4-week window ahead of a major Salesforce release when all preview sandboxes are upgraded to the next major Salesforce release. Between now and May 6, 2021, salesforce route all sandbox requests to preview instances. If your sandbox request is complete in time, salesforce upgrade it to Summer ’21.
On May 7, 2021, Salesforce reset all incomplete sandbox requests to a non-preview instance. All pending and new sandbox requests are routed to non-preview instances until your production instance is upgraded to Summer ’21. Salesforce can create sandboxes only on the same major release version of Salesforce as production.
On May 7, 2021, Salesforce reset all incomplete sandbox requests to a non-preview instance. All pending and new sandbox requests are routed to non-preview instances until your production instance is upgraded to Summer ’21. Salesforce can create sandboxes only on the same major release version of Salesforce as production.
Is your sandbox on a preview instance?
- Use the Sandbox Preview Guide to determine if each of your sandboxes is on a preview or non-preview instance. Enter your sandbox instance name(s). The guide tells you if it’s preview or non-preview and what to do to either move to the next release (Summer ’21) or stay on the current release (Spring ’21). You can also check multiple sandboxes and view the full list of preview and non-preview instances.
- To check numerous sandboxes, you can download the attached csv file that lists all the preview and non-preview sandboxes.
For more details on Salesforce sandbox preview instance, check the below link.
https://help.salesforce.com/articleView?id=000357271&type=1&mode=1