Error: "The account number or software serial number entered is not valid, please try again."

Summary

Users of Sage 200 Professional on premise may receive the below error message when reactivating an expired serial number or there are 2 serial numbers that are swapped over.

Description

Image

Resolution

To resolve this you need to delete the entitlement folder on the server machine which is located in C:\inetpub\Sage 200 App Services\Sage200SecuredServices\Entitlements prior to inputting the new serial number- Ensuring the letters are capitalised 

 NOTE: We communicated this to Partners and Developers on 10/01/2025, find out more here. 

Solution Properties

Solution ID
250110131943030
Last Modified Date
Thu Dec 18 15:17:23 UTC 2025
Attributes
Product Details
Modules: Financials
Modules: Report Writer
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