in all fairness bud, adhesive won’t play a part either, what happens is,as this type of screed dries the moisture rises to the top as it dries and forms a mineral on top, in effect a barrier between floor and
tile,(so your sticking to the mineral and not the floor,this needs to be ground/sanded off then primed twice, one diluted,usually 1 part primer 3 parts water which will soak in and when dried,you will then go over again with neat primer.
Because even after sanding the calcium screed reacts all
cement based adhesives hence the need to prime