Based on the information provided in the context, it appears that the prebuilt-tax.us.1098 model is not currently available in Power Automate. However, it is possible to use other prebuilt models in Power Automate by selecting the "Predict from AI Builder" or "Predict using AI Builder models from Microsoft Dataverse" actions and choosing a prebuilt model from the list of available models. It is unclear from the context whether there are any restrictions on Power Automate being able to access certain prebuilt models.
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