IDT Incorrect Token URL in Documentation — www.idtdna.com returns 500, should use region-specific host (e.g. sg.idtdna.com)

[GeneCodeSavvy]

While working with the IDT API, I encountered an issue with the OAuth2 token endpoint specified in the documentation.

Problem

The docs instruct developers to send token requests to:

https://www.idtdna.com/Identityserver/connect/token

However, this URL consistently returns an HTTP 500 Internal Server Error for me.

Working Solution

After some investigation, I found that using the region-specific subdomain works correctly. In my case:

https://sg.idtdna.com/Identityserver/connect/token

This endpoint successfully returns an access token using the same credentials and request payload.

Screen.Recording.2025-05-05.at.23.57.12.mp4

[GeneCodeSavvy]

I have mailed the IDT team, and will post updates here.

[GeneCodeSavvy]

IDT API team do not have a direct solution for dynamically setting the preferred host.
They have provided the list of supported sub-domains.

Region	Subdomain	Description
Americas	www.idtdna.com	North and South America
EMEA	eu.idtdna.com	Europe, Middle East, and Africa
APAC	sg.idtdna.com	Asia-Pacific region

Checking for all sub-domains brute force, before erroring out should be a simple solution

class IDTAccountAccessor:
    """Class that wraps access to the IDT API"""

    _SUBDOMAINS = ['https://www.idtdna.com/', 'https://eu.idtdna.com/', 'https://sg.idtdna.com/']
    _TOKEN_ENDPOINT = 'Identityserver/connect/token'
    _SCORE_ENDPOINT = 'api/complexities/screengBlockSequences'


    def __init__(self, username: str, password: str, client_id: str, client_secret: str):
        ....
        self.base_url = None
        self.token = self._get_idt_access_token()

    def _get_idt_access_token(self) -> str:
        ....

        for domain in IDTAccountAccessor._SUBDOMAINS:
            result = post(f'{domain}{IDTAccountAccessor._TOKEN_ENDPOINT}', data, auth=auth, timeout=IDTAccountAccessor.SCORE_TIMEOUT)
            if result.status_code == 200:
                self.base_url = domain
                return result.json()['access_token']

        raise ValueError('Access token for IDT API could not be generated. Check your credentials.')

    def get_sequence_scores(self, sequences: list[sbol3.Sequence]) -> list:
        ....
        for idx, partition in enumerate(partitions_sequences):

            resp = post(f'{self.base_url}{IDTAccountAccessor._SCORE_ENDPOINT}', json=partition, 
timeout=IDTAccountAccessor.SCORE_TIMEOUT,
                        headers={'Authorization': 'Bearer {}'.format(self.token),
                                 'Content-Type': 'application/json; charset=utf-8'})
            response_list = resp.json()

[GeneCodeSavvy]

Any thoughts? @Gonza10V @jakebeal @PrashantVaidyanathan
Should I make a PR? My credentials were failing tests due to this bug.