URL_RULE_NOT_CONFIGURED when sending email

Hi,

I've followed all the necessary steps, read all the documentation and tried to reproduce the solutions for every ticket with the same title. Sadly, none of these solutions work for me.

- I know I have a valid access token, I keep getting fresh ones through the refresh token endpoint;
- I know I am in the correct region (EU);

- I know i have the correct scope for sending emails (ZohoMail.messages.CREATE);

- I think I have the correct account ID. I can't really verify because following the instructions to GET http://mail.zoho.com/api/accounts returns an "INVALID_OAUTHTOKEN" eventhough I just generated that exact token. Still, I think I have the correct account ID, i got it from inspecting the XHR requests in the Portal;

Doing a POST on https://mail.zoho.eu/api/accounts/{accountid}/message with all the necessary parameters, ALWAYS returns the same issue, which is by the way, not explicit in any way or form.

Please tell me what I'm doing wrong.

Thanks in advance.

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