Unable to update Account record

Unable to update Account record

I am making a call to https://www.zohoapis.com/crm/v7/Accounts/${account_id} using Axio Put. The payload I am sending it is in the correct form as per the docs: { data: [ Account_Name: 'Test Name' ] }. However, I continually get a Bad Request error (status 400). The data returned is '<!doctype html><html lang="en"><head><title>HTTP Status 400 – Bad Request</title><style type="text/css">body {font-family:Tahoma,Arial,sans-serif;} h1, h2, h3, b {color:white;background-color:#525D76;} h1 {font-size:22px;} h2 {font-size:16px;} h3 {font-size:14px;} p {font-size:12px;} a {color:black;} .line {height:1px;background-color:#525D76;border:none;}</style></head><body><h1>HTTP Status 400 – Bad Request</h1></body></html>'. I'm not sure what I'm doing wrong. My client has access to the following scopes: ZohoCRM.org.ALL ZohoCRM.modules.ALL ZohoCRM.settings.ALL contracts.contracts.ALL. I think that's all I need to be able to update records. Any idea what's wrong??