how I contact Microsoft support for assistance in recovering it.
We loose the RDS CAL license number, the license number was sent via mail but unfortunately we loose that.
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Subhasis Bhattacharyya
0
Reputation points
Dear Team Microsoft,
we purchased a WINDOWS SERVER 2025 USER CAL capacity of 25 users as on 20.08.25 from our local verified vendor as on 20.08.25, now the issue is we lost the USER CAL LICENSE KEY. now we are in crisis will you please help us for getting the LICENSE KEY. we are ready to share also purchase invoice if there is required. Kindly help us.
Windows for business | Windows Server | Devices and deployment | Recovery key
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AI answer
2026-01-20T12:08:42.0766667+00:00 If you have lost your RDS CAL license key, you will need to contact Microsoft support for assistance in recovering it. You may be required to provide proof of purchase, such as an invoice, to verify your ownership of the license. It's important to keep a copy of the license key pack ID, as this can facilitate communications with Microsoft regarding your RDS CALs.
You can find more information on how to migrate or recover your RDS CALs in the documentation provided by Microsoft.
References:
- Migrate your Remote Desktop Services Client Access Licenses (RDS CALs)
- License Remote Desktop Services with Client Access Licenses (CALs)
- Find and use product keys for volume licensing
- OEM license and billing FAQ for Azure Local
- Activate Windows Terminal Server and Remote Desktop Service (RDS) without a product key
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