I am easily able to connect to this same data source using Microsoft Power BI. Using same credential I keep getting the error "Something went wrong getting data"
I would first recommend checking Domo's documentation on the MySQL connector:
If you're not able to locate any answers there, then I would double-check to make sure that any necessary API permissions have been granted to the account/credentials.
If all else fails, feel free to reach out to your Domo account team for more help.