We know for sure there is an expected sign to bear witness one has the Holy Ghost.
Acts 8 proves this. How did Phillip KNOW the Samaritans had NOT received the Holy Ghost?
Obviously there was a way to know. Phil KNEW they had not yet received the Spirit. He called for Peter and John because he KNEW they had not received.
The doctrine that one automatically receives the Spirit either at belief or belief and baptism is wrong.
One may say
Acts 8 does not say what the sign was when the Spirit was received. True enough. However in other places such as
Acts 2, 10, and 19 tongues are specifically mentioned.
Matter of fact except for prophesy that also came with tongues at Ephesus no other sign is shown initially following the Spirit baptism.
If we had one example of another sign bearing witness of the baptism I would be all in. I just cant find one.