In the report server manager Database interface, you can change it to another RS database or create a new RS database. Once complete, you need to restart the server before accessing the web portal.
Paul Zheng _ Community Support Team
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My apologize, I thought this is a report server question. Seems you are using Power BI Service not Power BI Report Server.
This is Power BI Report Server Forum, they are 2 different services. We also have other forums: Get Help with Power BI - Microsoft Power BI Community
Glad you were able to open the report successfully. For new database in Power BI Service, should be fine if you correctly added the new datasource connection in manage gateways,
I reset the gateway connection for this data set in the data set last night, but it still doesn't work. This morning, I just opened it without setting anything. I don't know where the problem is at present.