LAST UPDATED: FEB 20, 2023
You may see this error message when trying to activate your Trend Micro Maximum Security, Trend Micro Internet Security, or Trend Micro Antivirus Plus Security program:
"You have not provided a valid serial number."

Your serial number is the 20-digit activation code you can use to register your Trend Micro program.
Example format: XXXX-0000-0000-0000-0000.
'X' represents a letter; '0' for a number.
Why did this happen?
You may have entered an incorrect combination of your serial number. You may also have been provided a new one for your subscription.
How do I fix this?
Get help from our experts
If you're unable to activate your Trend Micro product on your own, don't hesitate to seek assistance from our experts. You can get in touch with us by giving us a call or starting a chat.
I can do it on my own
If you feel capable of activating Trend Micro Security on your PC, just follow these three simple steps.
Double-check the serial number you typed depending on where you purchased Trend Micro:
- Online: You will see it on the Order Confirmation Email.
- Retail: Check on the Receipt or Product Box.
- Existing Subscription: Log in to your Trend Micro Account to see the list of your ongoing licenses.
If the serial number matches with what you entered, follow theses steps:
Expand All
I am a new user
Create your own Trend Micro Account
Sign up with own Trend Micro Account to start using Trend Micro Security:
- Go to https://account.trendmicro.com/setup/landing.
- Click the Get Started button.
- Enter your email address or your mobile phone number to create a new Trend Micro Account, then click Next.
- Create your own password, then click Next.
- Fill up the details to complete your profile.
- Enter the serial number to activate your subscription.
- Go back to the Trend Micro Installation window, then retype again the serial number.
I already have a Trend Micro Account
Sign in with your Trend Micro Account
Try to sign in with your Trend Micro Account to activate your existing subscription:
- Click the Sign In button on Option 1.
- Enter your email address and password to log in.
- Follow the prompts to activate your protection.
I have a new serial number
Activate your new serial number
Register your new serial number to add in your Trend Micro subscription:
- Go to https://account.trendmicro.com/setup/landing.
- Click Or sign in to your Trend Micro Account link you see under the Get Started button.
- Enter your email address/phone number and password to log in.
- Enter the new serial number to activate your subscription.
- Go back to the Trend Micro Installation window, then retype again the serial number.
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