I found that Brooklyn is a little less forgiving in query strings and conditions when typos are made - previously they may have worked.
Can you double check this string:
The Query string i have on my page include properties is id={{$Param.id}}&accId={{$Model.Entitement.data.0.AccountId}}
I noticed your model name is Entitlement spelled wrong. Does it match your model name?
Also make sure AccountId is included in your Entitlement model.
Other thing I would check is case sensitivity of your url parameters… are they really ‘id’ not ‘Id’ and ‘accId’ not ‘accid’ and things like that.
Related to that, check your model conditions to make sure the case is exactly the same as the query string.
So bottom line, make sure all the fields you are using to query or pass to other queries are included in your model(s), and your spelling is perfect on case.
