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Hi Antoni, check out the special instructions for working with Tableau Online:
Specifying Resources on Tableau Online
For scalability and reliability, the Tableau Online infrastructure extends over multiple server instances. In this environment, each site is assigned to a distinct instance (or pod). When you sign in using online.tableau.com, the site redirects you to the instance where your site resides. You will see the redirect reflected in the URL shown in the browser’s address bar. For example, instead of online.tableau.com, it might show the following address:
When you make REST API calls to Tableau Online, rather than using online.tableau.com, you need to use the URL for the instance on which your site exists.
The following URI specifies an individual project on a site on the 10ay instance: