If the HomeRunner connection to Guesty suddenly stops working, or Central shows the token as expired or invalid, the cause is most often a change on the Guesty side.
Why this happens. Usually your Guesty account has been canceled or downgraded. When a Guesty account is closed, HomeRunner can no longer connect to it, even though the connection record on the HomeRunner side still exists.
What you can do. The connection can only be restored once your Guesty account is active again. If you are moving from Guesty to a different property management system, HomeRunner can connect your new system for you instead.