@pohodnica as you probably know, St Jean is 74 kilometres from Pamplona along minor roads. People usually travel from Pamplona to St Jean by bus, as shown in the thread posted by
@Raggy - see the end of the
thread for up to date information. The company that run the buses is Conda, but as the thread explains they are not currently running that route because of restrictions due to the pandemic, and also because there have not been any passengers to take.
The forum does have a section
here where you can post a thread to see if there is anyone who wants to share a taxi with you. You will have to nominate the date and time of your arrival in Pamplona.
Baggage services normally run between St Jean and further along the camino and they may also have transport services, but until things start to run more normally it is hard to know. Try contacting
Jacotrans for information about when they will resume service.