It's been so long to find a freebie code for Paramount Plus. I finally found one.
Expiration of the code it's unknown.
Use the code GOLD at the final stage of the sign up.
It will need your payment details so make sure to cancel immediately after signing up to avoid paying the fees, and you still keep your free month. (Maybe, you need to wait 7 days and then cancel. People tried to cancel immediately and looks like they have given only 7 days free trial.)
It's for new subscribers only.
So if you have already had a trial here, simply use another email. You can still use the same Card as previously, you just need a new email sign up.
Cheers OP