Hi @mirtiza ,
Please try to run Get items without configuring Filter Query and check the Body of it.
Get the display name of the column and configure it to Filter Query.
And please add a space between ' and eq.
Besides, if the Location is the lookup column to Location based engineer list, you could use Get item action to get the item in Location based engineer list.
You just need to fill Location Id in the ID field of Get item action.
Please take a try and feel free to let us know if you have any other questions.
Best Regards,