Power BI - Unable to connect: This data source cannot connect to any gateway instances of the cluster. Please find more details below about specific errors for each gateway instance.Show details Troubleshoot connection problems

You are probably blocked by the firewall rules on the machine.

If it was working before, and not working now, there may be rules allowing connection while you're in the office, but not when you're outside.

Get your admin to add your current IP to the access list