About zoom authentication

I have a question about API authentication for zoom.
I entered my domain in the image below, uploaded the html file, and then downloaded the file, but it does not work.
What error could this be?

Hi @4869nanataitai !
Thanks for reaching out! I am happy to help here!
We can help you by manually validating the domain for you!
Feel free to send an email to marketplace_support@zoom.us so we can take it from there!