remove the This domain is not registered... warning message. code example

Example: This domain is not registered with Tiny Cloud. Please see the quickstart guide or create an account.

Ensure you are using the correct API key wherever you are loading TinyMCE 
within script tags. For example, in the following code, no-api-key needs to be 
replaced by the API key provided with your account:
<script src="https://cdn.tiny.cloud/1/no-api-key/tinymce/5/tinymce.min.js" 
referrerpolicy="origin"></script>