SharePoint Sync Between 2 Different Tenants

Question

We have two SharePoint tenants (Tenant A and Tenant B).

Tenant A includes 20 different sites, each with its own document library, while Tenant B has a single site with one document library.

The requirement is to synchronize all document libraries from the 20 sites in Tenant A into one document library in Tenant B.

Please confirm if SharePoint supports syncing multiple source site document libraries to a single destination site document library.

Answer 1

Dear @Kapil Jindal, 

Thank you for posting your question in the Microsoft Q&A forum.   

I understand how important it is to have a smooth and reliable way to centralize content across tenants. Unfortunately, SharePoint is designed to sync content between the cloud and a user’s device, so it does not natively support continuous synchronization of multiple libraries across different tenants. Library‑to‑library or tenant‑to‑tenant sync isn’t built in, but other approaches can help achieve your scenario depending on your needs. 

Here are some options you can consider: 

Option 1. Perform a one‑time cross‑tenant migration, then consolidate content inside Tenant B 

This approach works best if your goal is to eventually operate fully within Tenant B. 

Step 1: Use Microsoft’s cross‑tenant SharePoint migration capability to migrate each site in Tenant A into a newly created site in Tenant B. This process requires the Cross‑Tenant Shared Data Migration license and the target sites must not exist beforehand. 

Step 2: Once the content is migrated, consolidate it into your single library by using the modern Move to or Copy to commands across sites. Move to preserves version history while Copy to transfers only the latest version. 

Step 3: After consolidation, verify permissions, metadata and file paths to ensure everything aligns with your organization’s structure and governance. 

If you are eligible, Microsoft FastTrack may also guide you through cross‑tenant migration planning and execution. 

Option 2. Keep content in Tenant A and allow Tenant B users to collaborate directly 

This option is helpful when the goal is central access rather than central storage. 

Step 1: Share the necessary sites or libraries in Tenant A with users in Tenant B through Microsoft Entra B2B collaboration. 

Step 2: Adjust external sharing settings and permissions so that users in Tenant B can work with the content while it remains in its original location. 

Step 3: Establish governance and access rules to ensure that all collaboration is secure and compliant with your policies. 

This model avoids migration entirely and maintains a single source of truth while still providing a unified experience for users. 

Additional information is available in the following resources: 

Cross-tenant SharePoint site migration overview - Microsoft 365 Enterprise | Microsoft Learn 

Cross-Tenant Migration - FastTrack – Microsoft 365 | Microsoft Learn 

Overview of external sharing in SharePoint and OneDrive in Microsoft 365 - SharePoint in Microsoft … 

I completely understand that these limitations can sometimes feel restrictive, especially when you are trying to create a clean and centralized structure for your organization. It’s not just about aesthetics; these differences can genuinely affect how smoothly you work and navigate your day. 

As a forum moderator, I hope you understand that I don’t have the ability to modify or escalate product issues directly. However, I strongly recommend submitting your feedback through the SharePoint · Community portal. This is the most effective way to ensure your voice reaches the product team and can be considered for future improvements.  

Once you've submitted your feedback, feel free to share the link here in the comments. I’ll be happy to upvote it to help bring more visibility. If you prefer, I can also submit this great idea on your behalf. Just let me know, and I’ll post it for you and share the link once it’s published. I’m here to help ensure your feedback gets the attention it deserves. 

Additionally, as other users have raised similar concerns and may not be aware of where to share their feedback, I hope this response helps clarify the situation and suggests a potential next step. Highlighting this information can make it more visible to others in the community who may be facing the same issue, making it easier for them to find guidance and contribute their feedback as well. 

Thank you again for your time and for raising this important usability concern. 

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Answer 2

SharePoint Online does not provide a built‑in capability to continuously synchronize multiple source site document libraries from one tenant into a single destination document library in another tenant.

Supported cross‑tenant capabilities in the provided context focus on:

• Cross‑tenant SharePoint and OneDrive migrations (one source site to one target site, with constraints such as “You can't overwrite or merge an existing site” and per‑site limits), not ongoing multi‑library sync into a single library.
• User synchronization between tenants via Microsoft Entra cross‑tenant synchronization, which is for identities, not for document library content.
• Client “Sync” (OneDrive sync client) to move or copy files between folders and libraries, which is a desktop‑based, manual or scripted copy/move mechanism and explicitly not a multi‑source-to-one-library cross‑tenant sync solution.

Therefore, the described scenario—automatically syncing 20 separate document libraries in Tenant A into a single document library in Tenant B—is not supported as a native SharePoint/OneDrive feature. It would require custom tooling, migration jobs, or manual/desktop-based copy approaches rather than a built‑in SharePoint synchronization feature.

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References:

• Cross-tenant SharePoint migration
• Use Sync to copy or move files between folders and libraries
• Step 1: Connect to the source and target tenants
• Step 1: Connect to the source and target tenants (SharePoint)
• Synchronize users in multitenant organizations in Microsoft 365
• Plan document libraries in SharePoint Server