@Nomad_Housesitter You must report this to THS asap so they are in the loop - you can call the Urgent Support Line 24/7 phone number and they will explain the process to you .
We had a similar situation where host was injured and was coming home early but they didn’t know exactly when they would get flight back home . We notified THS immediately and then updated them when the situation was clarified in the meantime they talked us through the process and what would be required.
If the host can message you through the inbox to state that they are returning home early- THS will be able to see this conversation.
The Urgent Support Line 24/7 phone number is on your dashboard .
Here’s a link to a thread that discusses the claims process - please read and add your experience to it if you make a claim .
https://forum.trustedhousesitters.com/t/tried-tested-process-for-premium-insurance-claim