public async Task <ActionResult> SignInExternal(SaveTemporaryEmailAccountCommand command)
{
await _mediator.Send(command);
var oAuth2AuthRequest = OAuth2Helper.CreateRequest(command.Email, command.UserId,
$"{Request.GetBaseUrl()}{Url.Action("LandingExternal")}", M365Helper.EmailScopes);
return(View(oAuth2AuthRequest));
}