what is your data source?
Your lookup and filter are not used correctly.
You have Lookup(Datasource;filter(),valuetoreturn)
Should be Lookup(Datasource;condition,valuetoreturn)
Like LookUp(Integrantes,Idend=ThisItem(Idend,Sum(...)
what is UN? is that a different list?
You are telling it to look up a value from integrated without giving it a column in that list to match against?
If I could make a suggestion, you might want to consider doing a calculated field in your data source (assuming it is SharePoint or CDS)
That will be a lot easier.