If I buy a 1 month to global eurail pass, only I can to use the pass in June or maybe July too?

Hello I am travelling through Scandinavia in September with the Interailticket. I got a new ID number because I lost my ID card. Now my ticket has my old ID number on it. Is this a problem for the trip?

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It MAY be  a prob when a very thorough conductor wants to check everything-and in some countries they even have very special check-teams who are trained to know all possible frauds and ways people use to avoid right payment. They do random checks-very, very rarely. IR passes-and also as most holders are young and often brash juniors-are much known for frequent fraud attempts. Mostly though old style paper pass by fiddling with the dates to travel on. This is no more possible with mobile.

I guess you have some proof that you reported to authorities the lost ID-show that together with the new one-same name etc.- and I assume most conductors will accept this-in the rare cases they even ask for it. But it is a potential problem

As far as have understood you should be able to change the ID number connected to your pass yourself as long as your pass isn't activated.