'Unauthorized to get _api/contextinfo from a Sharepoint domain with POSTMAN Forbidden reason

Starting from two Sharepoint domains, say accessible.sharepoint.com and unaccesible.sharepoint.com, from POSTMAN, we are able to access _api/contextinfo in the first case (200 OK), but not in the second (403 Forbidden).

In concrete:

{"error":{"code":"-2147024891, System.UnauthorizedAccessException","message":{"lang":"en-US","value":"Attempted to perform an unauthorized operation."}}}

Could someone tell me what actions I have to ask the technicians who control the unaccesible.sharepoint.com domain to carry out?

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Solution 1:[1]

Finally, we are able to do that, connecting to site level: https://unaccesible.sharepoint.com/sites/<our_site>/_api/contextinfo

Sources

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Source: Stack Overflow

Solution Source
Solution 1 JLLMNCHR