I am trying to book a Eurostar ticket but it says my inter rail ticket is not valid on that day even though I have a ticket for the journey on the app .
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If you have the journey in the app or not doesn´t matter as both systems are seperate 
Means they have no connection to each other.
Where are you trying to book? Eurail/Interrail? B-Europe?
What error message you get?
Which date?
Which pass do you have? Only Globalpasses are valid on the Eurostar services :)
What is country of residence on the pass? Maybe you already have used both Country of residence journey´s known as Outbound/Inbound journey
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