Hi @martinav,
It seems like the issue is caused by the SQL server connection change into a premium connector.
I find your first reply is using Get row action, this action has been deprecated, it seems like the action was created before the SQL connector changed, so you can see it still exist in your Flow, you can delete it and try to use Get Rows(V2) action.
https://docs.microsoft.com/en-us/connectors/sql/#actions
I just tested on my side to use Get rows(V2) to get all rows of a SQL table, the connection is old, but it works well, so maybe the error in the reply 2 is caused by the connection itself, changed gateway, changed password, etc. You can reconfigure it and try it again:

And you are search the license details, this is the PDF file of the licensing guide, you can download it to see more details.
https://go.microsoft.com/fwlink/?linkid=2085130
Best Regards,
Community Support Team _ Lin Tu
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.