Every time I try to invite someone (I know the username is correct) to a repo or organisation, I can’t. The button is disabled and just says “Select a team or member above”. I type (paste) the full username in the box, but even enabling the button in source doesn’t let me click it.
The console says:
TypeError: window.customElements is undefined
So it seems you’re trying to use unsupported features. Even when adding a polyfill it doesn’t always work (I have to repeatedly refresh the page, that’s probably more of an issue with the polyfill injection method, but I shouldn’t need to inject that at all).