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Fix SharePoint Online Custom Template Tab Missing Across Tenants
Question details
The user is unable to find the Custom tab when attempting to apply a custom SharePoint site template in a different Microsoft 365 tenant.
- Product
- SharePoint Online
- Device & OS
- not provided
- Scenario
- Uploading and applying a custom SharePoint site template exported from one Microsoft 365 tenant into a second, completely separate tenant.
- Observed behavior
- The site template successfully uploads to the new tenant, but the 'Custom' tab is entirely missing from the template selection interface, preventing the user from applying it.
Verify that you have SharePoint Administrator or Global Administrator privileges in both Microsoft 365 tenants, and ensure both tenants are using distinct domain names.
Contact Microsoft Support for Cross-Tenant Investigation
Because cross-tenant template failures are an unexpected backend behavior, you must contact Microsoft Support to collect logs and resolve the tenant synchronization issue.
A custom site template saved from Tenant A should normally populate under the Custom tab in Tenant B. When this fails despite successful upload, it indicates a backend processing or syncing error within SharePoint Online that cannot be fixed via user-facing settings.
To expedite the resolution, gather your tenant domains and replication steps before opening a ticket.
Write down the exact initial domain names for both Microsoft 365 tenants (e.g., tenantA.onmicrosoft.com and tenantB.onmicrosoft.com). Confirm that they do not share any custom domains, as a single domain cannot be registered to two tenants simultaneously.
Log in to the Microsoft 365 Admin Center of the destination tenant (where the Custom tab is missing) using Global Administrator credentials.
Navigate to 'Show all' > 'Support' > 'Help & support'. Briefly describe the issue, specify that it is a cross-tenant SharePoint template issue, and request to open a service request.
When contacted by the SharePoint Online development team, provide the source template file and allow them to run diagnostic tools to collect backend logs for the missing Custom tab.
Try WPS Office for Seamless Document and Template Management
While resolving complex SharePoint tenant issues requires Microsoft Support, handling your daily office documents and templates doesn't have to be complicated. WPS Office provides a lightweight, comprehensive suite for all your document, spreadsheet, and presentation needs.
- 1. Download the installer: Visit the official WPS Office website and download the free installation package for your operating system.
- 2. Install WPS Office: Run the downloaded installer and follow the quick on-screen instructions to set up the software.
- 3. Manage your templates easily: Open WPS Office and navigate to the Template Store to discover, use, and save your own custom document templates directly.
Frequently Asked Questions
Can two Microsoft 365 tenants share the same custom domain?
No. A specific domain can only be registered and verified in one Microsoft 365 tenant at a time. To use a domain in a different tenant, you must completely remove it from the original tenant first.
Why is the Custom tab completely missing in SharePoint Online?
The Custom tab usually appears only when at least one custom template is successfully uploaded and processed by SharePoint. If it is missing, the template upload may have failed silently, there may be a backend syncing delay, or it could be an unexpected cross-tenant bug requiring Microsoft Support.
How long does it take for a new SharePoint site template to appear?
Under normal circumstances, a newly uploaded SharePoint site template should be available within a few minutes. However, propagation can occasionally take up to 24 hours. If it exceeds this time frame, backend investigation is highly recommended.
