Sign in says the method is unavailable, or will not stay signed in.

This is almost always your browser refusing to store anything for automep.app rather than a problem with AutoMEP. Signing in needs to keep a small amount of data for the site, so if cookies and site data are blocked for automep.app, Google and Microsoft sign-in both stop before they start and an email sign-in will not stay signed in. Open your browser's site settings for automep.app and allow cookies and site data, then try again. Two quick ways to confirm it: open automep.app in a guest or private window, where the default settings usually apply, or check the small icon at the left of the address bar, which is where browsers show what is blocked for the site you are on. Browser extensions that block trackers can do the same thing, so if you use one, allow automep.app in it. If sign-in still fails after that, use the form on this page and tell us which browser you are on.