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No one can really trouble shoot this for you without seeing you configuration details, so you need to get your IT people involved I suspect.
it seems like the credentials used by the server do not have access to the SQLServer where Tableau lives.
If you are using Windows authentication then the Account on the Server running the flow needs write access to Tableau's site/project. In Tableau each account is tied to a group and site role typically. permissions can be given at each level and you may not have this account set right.
An admin can quickly see if the Server Account in use has the right permissions. If that is not the issue then explore the other things in the link.