Script Error when logging in via Enterpise Gateway Wizard

Hi All,

I've installed Enterprise Gateway, to enable publishing of Dashboards and it appears to have installed OK. Once installed, it tells me I need to sign in to Power BI, to configure the gateway. When I click on the "Sign in to Power BI" button, I get this error;

Regardless of what I then click (Yes, No, or the X at the top to close), nothing happens, other than this small window closes, which takes me to this;

The email address in that window wasn't typed in by me at any point, so must have been picked up from Power BI, I assume. Note that the apostrophe in my name (which does belong in the email address) is replaced by ' (I'm not sure if that's relevant). Again, regardless of what I do, nothing happens, so my only real option is to close this window also (the ellipses are not clickable, nor is the blue circular icon on the left), which takes me back to the start of the wizard again, where I tried to sign in to Power BI in the first place;