DAX logical AND condition based on multiple selection

Mate, first of all, measures do not return tables. Only single values.

Second of all, here's a measure that will tell you for each session whether it has all the codes selected in your dimension:

[Session Has All Selected Codes] =
var __visibleFailureCodes = VALUES ( FailureCodes[FailureCode] ) -- note the "s" on the end (dims should end in "s")
var __numOfVisibleCodes = COUNTROWS ( __visibleFailureCodes )
var __oneSessionVisible = HASONEVALUE ( FactTable[Session] )
var __existingCodesForSession =
	CALCULATETABLE (
		VALUES ( FactTable[FailureCode] ),
		VALUES ( FactTable[Session] ),
		__visibleFailureCodes,
		ALL ( FactTable )
	)
var __numOfExistingCodes = COUNTROWS ( __existingCodesForSession )
var __sessionHasAllSelectedCodes = ( __numOfExistingCodes = __numOfVisibleCodes ) 
return
	if ( __oneSessionVisible, __sessionHasAllSeletedCodes )

Best

Darek