Licenses or features are missing in sandbox

If you can't refresh your sandbox, try using the Match Production Licenses to Sandbox without a Refresh tool. The tool matches all provisioned licenses, limits, and features in the production organization, including storage limits and org edition. To match licenses to a sandbox organization, log into your sandbox, and then from Setup, navigate to:
 

In Salesforce Classic: Company Profile | Company Information | Match Production Licenses
In Lightning Experience: Company Settings | Company Information | Match Production Licenses

Before you use the matching tool

• Don't use the matching tool if the sandbox's related production environment is in trial or demo status, since doing so can cause destructive changes that can only be corrected by a sandbox refresh. If you’re unsure whether the sandbox's production organization is in active status, log a Case with Salesforce Support to confirm before using the tool.
• All provisioned changes from production are matched, including any license decreases, limit decreases, feature removals, as well as increases and Salesforce Edition upgrades or downgrades.

Other considerations

• If your sandbox's related production environment is in a status other than Active or you're unable to leverage the matching tool, in most circumstances, the license count may be manually updated by logging a case with Support.

Note: Some features must be enabled in the sandbox before Support can perform a manual match. If the feature was newly purchased in production, Support may not be able to manually enable it in the sandbox to match the licenses. When this occurs, the only alternative is to use the Match Production Licenses tool or refresh the sandbox.

• Match License Tool works across different release versions.
• When you upgrade the edition of your organization, its corresponding sandbox will retain the edition prior to the upgrade. In this case, it's best to opt for Match Production Licenses instead of refreshing the sandbox.
• Data and File storage limits are only matched to Full Copy sandboxes. Developer, Developer Pro, and Partial Copy sandboxes all have storage limits that are defined by their sandbox type.