Obviously it’s difficult to say without seeing your code, but I’m assuming it was written for Blynk Legacy.
Blynk Legacy used the Blynk.notify() and Blynk.email() commands to send in-app notifications and emails. These two commands have now been retired, and instead if you want to send a notification or an email then you have to log an event and configure that event to send a notification or an email.
More on that here…
The web user interface has changed slightly since that guide was written, but the general principals still apply.
If you do post your code (or compiler errors or serial monitor output) to this forum then it needs to have triple backticks at the beginning and end of the code so that it displays correctly. Triple backticks look like this:
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copy and paste these if you can’t find the correct character on your keyboard.
Pete.