Please help me solve Invalid Auth token problem.

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@Malewan_Tananchai Please edit your post, using the pencil icon at the bottom, and add triple backticks at the beginning and end of your code so that it displays correctly.
Triple backticks look like this:

Copy and paste these if you can’t find the correct symbol on your keyboard.

I’d also suggest that you redact sensitive information from your code, and provide more information about whether you are using Blynk Legacy or Blynk IoT, which version of the Blynk library you are using, etc.