Refreshable dataset with data from On-premise BC AND Sharepoint

Hello

I can make refreshable dataset with data from:

- On-premise BC via "Gateway connection"

- Sharepoint file via "Data source credentials"

But I cannot make a refreshable dataset with data from both. I get this error:

"Scheduled refresh is disabled 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. Then reactivate scheduled refresh."

I have entered the "Data source credentials" for sharepoint info, but the gateway has listed this error: Web{"url":"https://HIDDEN.sharepoint.com/sites/SITENAME/Shared%20Documents/File.xlsx"}

to the right it says "Optional - Add to gateway", but I can't seem to add it to the gateway no matter which Authentication Method i try. I assume that this is the reason why i get the error for Scheduled Refresh

Any ideas will be highly appreciated 🙂