Assurance is the feeling of professionalism and confidence that your learning function exudes. In other times, this was your performance as a shopkeeper, having the right stuff in stock for when it was needed.
You might not be feeling especially assured in these times but people will be looking to your function to help people feel confident. What are you doing to show that people can still trust your learning function to be there when they need you? And how do you guarantee what you offer?