Why is the serial number/activation key that you gave not working? It says the the four letters are not correct

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I renewed 3/2/16. I received my order confirmation via email. I thought my husband activated it, but no. When I enter the serial #/ activation key, it says invalid letters
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Posted 3 years ago

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Sorry to hear the issue you are encountering. Per your description, here's a related help doc that should be able to solve your issue:
“Invalid Serial Number” error message appears when activating Trend Micro Security program

If the issue does not resolve after you tried the steps, could you please provide more information, e.g. a screen shoot of the error. We will assist you soon! Thank you.

Trend Micro Home Users Community 

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