Refresh data set using power automate

Hi,

I want to refresh my data set using Power Automate, as don't want to install a data gateway.

My Data source credentials are grey, and I don't know why.

When I'm trying to run my power automate I get the following massage. 
What can I do?

Data source error: It looks like scheduled refresh failed because at least one data source is missing credentials. To start the refresh again, go to this dataset's settings page and enter credentials for all data sources.
Cluster URI: WABI-WEST-EUROPE-redirect.analysis.windows.net
Activity ID: 00000000-0000-0000-0000-000000000000
Request ID: 54d67407-666f-45d6-97e3-b8c2a83c022b
Time: 2023-04-30 08:47:07Z