Xero API (Using .Net Standard SDK) Problem when creating bank account

I am integrating with the xero API, I have a token which was requested with the following scopes

openid profile email offline_access files accounting.transactions accounting.contacts accounting.settings

I am running the following code :

var bankAccount = await _accountingApi.CreateAccountAsync(token.AccessToken, token.Tenants.FirstOrDefault()?.ToString(), new Account
{
    Type = AccountType.BANK,
    BankAccountType = Account.BankAccountTypeEnum.BANK,
    Name = "Clearing Account",
    BankAccountNumber = "00000000"
}, null, cancellationToken);

However when this executes I get a 403 error returned.

From what I have read in the docs this should work, the Account PUT notes in the Xero docs suggest that Im right, I just cant get it to work - what am I missing?

Solution

Did you also get a Ref number with the HTTP 403 response? If so, it can be used by Xero API Support to find the exact cause.

There are a few reasons why you could be hitting a 403.

The Access Token being used is expired and must be refreshed
The Tenant ID being used in the headers is missing
The user has revoked access
The Tenant is no longer active