Hi ccents, welcome to the community.
This is not something that we have seen requested by our customers through the various feedback channels, in fact this Idea has received no votes from the community or any other comments. The feature itself is not a requirement, every GoToAssist customer has the option to store the credentials of their Unattended computers, or not.
In regard to our multi factor security, it applies to signing into the GoToAssist Remote Support account on the website or the Desktop Console application before you can access the devices list. We also monitor for any unusual login activity a number of different ways and will prompt the user to verify their identity again if we detect anything unusual.
With GoTo Resolve we have introduced Zero Trust Authentication which you can read more about here.