Try Windscribe, it’s free, but only for a certain amount of use, at least you will know,, I am on Nord vpn and so is my son, yet he is getting the same message as you I have no problem, don’t really understand, also another free one is award vpn, you get 6 hours then have to enter a pin, I think that also works fine,, good luck I know it’s a bloody headache when things like this crop up.