Hi @Anonymous
Please follow the below steps and try if it solves your problem
1. Get the items from the locations list

2. Once you received all the master locations. Initialize an array variable to store the locations not checked in.

3. Iterate through all the locations from the master and check whether the items are there in List A. Check the length of the items, if it is less than or equal to 0 then you can add that location to the array variable declared above and using that array variable you can send the list in an email.


4. Make sure you use the correct filter query by accessing the lookup field.
5. After the 'Apply to each' action, you can get the final array of locations that are not checked in.
Hope it helps, please like it or mark it as a solution if it resolves ur clarification or issue
-Sudharsan K...