I have 2 sharepoint lists,
List A - EWO App
List B - EWO for maintenance
The flow I have is below:

When a list item is modified in List A, update that Item in List B
The flow works fine when I have the ID field set to ID, but the problem is that the list ID's are not the same between both lists (List B has a lot more items) so I am looking for another solution to use in the ID field. I have tried using title since the titles are unique but the flow keeps failing.
any ideas?