Hi,
I am using a free trail account to testing the flow with power bi dataset refresh. I use manual trigger by inputting the report name to trigger the refresh. Actually I have input the exact report name, the dataset cannot be refreshed based on my input string, the error details are as follow:

Below is the setup flow details:

And I am very sure that my connection account to the power bi has sufficient permission and the input string is exactly the same as the name of the power bi report.
BR,
Jason