Paris pass sos !!!

You need the Travel card that comes with it
https://www.parispass.com/paris-transport/travelcard-validity.html

I've never heard of the "Paris Pass" - but I just googled it. On their website, they explain that the pass includes a free "Paris Visite Pass (Travelcard)". And THAT is what you would use for metro, RER, etc.

https://www.parispass.com/paris-transport/
https://www.ratp.fr/en/titres-et-tarifs/paris-visite-travel-pass

You may be overlooking it
It is small looks like the regular metro ticket that
https://en.parisinfo.com/practical-paris/how-to-get-to-and-around-paris/fares-travel-passes-reductions

Looks like this:
https://parisbytrain.com/paris-visite-pass-card/

The Paris Pass is not a pass which is why you apparently overlooked the tiny ticket that is a much overpriced Paris Visite Pass. You put it through the metro style just like. a regular ticket except you can reuse it unlike regular tickets (that it looks just like). The Paris Pass is a kit of other products like the Museum Pass and Visite Pass you could have bought cheaper on arrival.

I am so glad you didn't somehow manage to get through the gate perhaps by following someone through the luggage bypass because if intercepted without a validated ticket the fine on the spot is 50 Euros. Hope you have it working now. (be sure you print your name on the pass as it is not transferable and if you don't have your name on it you can also be fined the 50.)

Note that the card is only good for zones 1 to 3 so if you are going outside of zone 3 (for example Versailles). You have to add value to it, ask someone in a metro office how to do this.