Salesforce Change Set Validation or Deployment Stuck in 'In Progress'

Resolution Path 1: Check User Permissions

Verify that the deploying user has the "Modify All Data" permission enabled:

1. Navigate to Setup > Users and locate the user who initiated the deployment.
2. Click their profile name to open the profile.
3. Under System Permissions, confirm that Modify All Data is checked.
4. If it is not enabled, enable it (or assign a Permission Set that includes it).
5. Re-attempt the Change Set validation or deployment.

Note: "Modify All Data" is a sensitive permission. Follow your organization's governance process before enabling it for users.

Resolution Path 2: Deployment Stuck for More Than 24 Hours

If the deployment or validation has been in progress or stuck for more than 24 hours and the permissions are confirmed:

1. Open a case with Salesforce Customer Support and reference article 000385294.
2. Ensure a System Administrator has granted login access to a Salesforce Support Agent.