I am trying to book tickets from UK to mainland Europe. Using the interrail site I get the message to try again later, and www.b-europe.com says I can only use a paper pass but I have a digital pass
You can call b-europe and make the reservation. No need of Pass Cover Number.
The phone call is rather expensive.
https://www.b-europe.com/EN/Contact/Contact-Centre
Another way to make reservations for French trains is to call SNCF. No need of Pass Cover Number.
https://www.sncf.com/en/customer-service/contact-us/telephone
Press #85 for English, no booking fees, reservations are sent via e-mail. Not all credit cards are accepted.
For domestic French reservations, you can also call NS. Also no booking fees and they do accept VISA. Remember the country code (+31)
To get your Pass Cover Number, if you still will need it, you need to contact Customer Support through this form and ask for the Pass Cover Number.
https://eurail.zendesk.com/hc/en-001/requests/new
Customer Support is currently overloaded with requests so you will probably have to be patient to get help. Please let Customer Support know what date your travel will start so that they can prioritise your request correctly.
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