"code": "500","description": "Account not exists", mail api

"code": "500","description": "Account not exists", mail api

I have been through all the steps and have a functioning Oath access_token etc etc... I then 
then
GET http://mail.zoho.com/api/organization/<hidden>/accounts and get the account details, which list the two accounts.
I then try and get a list of folders using the accountId's from the previous step, by hitting
The first of the two accountId's returns a list of folders, but when I use the other accountId I get back 
{
"status": {
"code": 500,
"description": "Account not exists"
},
"data": {}
}
The first accountId is that of the super_user account I used to create the access_token,
the other account is just a user account.

Ive used hundreds of API's over the years, this one has to be the most backward, poorly documented disaster ive ever experienced.
Even the example url's in the documentation are wrong,





      • Sticky Posts

      • Zoho Mail POP & IMAP Server Details

        Hello all! We have been receiving a number of requests regarding the errors while configuring or using Zoho Mail account in POP/ IMAP clients. The server details vary based on your account type and the Datacenter in which your account is setup. Ensure

      • Important update on Group Management | Zoho Mail

        Dear Zoho Mail Community, This post is to inform you all of the following updates on the Group Management in Zoho Mail. Group Member Addition: If a group member is added to an organization group in a Zoho Application, the member will be automatically

      • Mastering email etiquette and best practices to follow in Zoho Mail

        Hello Zoho Mail Community, We’re thrilled to invite you all to our upcoming webinar: Mastering email etiquette and best practices to follow in Zoho Mail. Join our live webinar for expert etiquette tips to enhance your professionalism and elevate your

      • 📣 📣 ZUG Meetups India - Explore Hybrid Workspaces using Zoho Workplace - Meet and Learn! 🧑🏽‍💻🧑🏽‍💻

        We are excited to announce the User Community initiative to meet you all in person and help you explore the need of the hour - Hybrid Workspaces using Zoho Workplace. We aim to help you to setup your Digital Workplace effectively so that your employees

      • Announcing Zoho Mail - Inactive user Policy

        Dear Zoho Mail users, Thanks to all of you for your continuous support.  We have recently started implementing the Inactive User Policy, for Zoho Mail.  A user is considered as inactive, if the user has not logged in to the Zoho mail account for a period of more than 120 days. The login through POP, IMAP and Active Sync are all taken into account for tracking the period of inactivity.  Whoever received the communication need not panic, as we have just communicated our policy to all the users.  To