Hello,
Thanks for your reply!
I am sorry that we cannot find your purchase information by the key, please provide us with your purchase email so that we can check it.
Please refer to the following screenshot to check for the version of Spire.Barcode.dll, and then share the version of Spire.Barcode.dll you are using. Besides, we do not have a special key for load balancing server. Once we get your purchase information, the version of Spire.Barcode.dll you are using and your code about Spire.Barcode, we will investigate the cause of the problem. Thanks in advance for your assistance.
CheckVersion.png
If you have any other question, please feel free to contact us.
Sincerely,
Marcia
E-iceblue support team
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