Getting error Apple In-App Purchase Key is invalid or not present

Hi @anhlq-supp that is strange and unexpected. Would you mind first checking that you’re using the correct RevenueCat’s Public API key? You can find this on the same page where you uploaded your key under the section Public API key. 

@Greenie Cheng you’re right I’m using the wrong Public API Key. Even though, when I change my old key in the project to the new key in the section, it returns this error.

There is an issue with your configuration. Check the underlying error for more details. There are no products registered in the RevenueCat dashboard for your offerings. If you don\'t want to use the offerings system, you can safely ignore this message. To configure offerings and their products, follow the instructions in https://rev.cat/how-to-configure-offerings.\nMore information: https://rev.cat/why-are-offerings-empty

My project already has a valid Public API Key, how can I reuse it? Or how can I update to the new one?

Update:
I’ve successfully configured everything following this guide .The problem is my app was linked with another account previously and I lost it.

Great to hear! Let us know if there’s any other issue! @anhlq-supp