API call Authentication Unsucessful

[adelinechong]

I went through all steps and is stuck at calling my first API.

I got the message 'Authentication Unsuccessful' as follows:

May I know what may cause the authentication issue? I am able to retrieve my tenant id.

[mvortizr]

It happens the same to me. I tried everything and don't know what's wrong

[keithcoughtrey]

I can only get invoices if I comment out the pre-request script. If I leave it there I get the error reported by @adelinechong

[ajmueller]

Hi all. I had a similar issue with authorization, though my error message was slightly different and posted this note in #2 as well. Mine was related to a newline character being included in my tokens by following the instructions. If you triple-click to highlight the tokens in step 6, Postman includes a newline character in both tokens. See a screenshot below of what how that newline character is represented (note the ↩️):

So in case your token has a newline, remove it and you'll be in good shape.

[saied-nawaz]

I went through all steps and is stuck at calling my first API.

I got the message 'Authentication Unsuccessful' as follows:

May I know what may cause the authentication issue? I am able to retrieve my tenant id.

in your scopes you need to add the following accounting.transactions

[bigfuture-test]

Anyone facing this issue, you need to set xero-tenant-id from connections response

[musabibnusiraj]

#9 Please check client id & client secret.

Anyone facing this issue, you need to set xero-tenant-id from connections response

[musabibnusiraj]

I went through all steps and is stuck at calling my first API.

I got the message 'Authentication Unsuccessful' as follows:

May I know what may cause the authentication issue? I am able to retrieve my tenant id.

#9 (comment)