Hello,
We're trying to make a customer portal user participant on different tickets, but he's not able to see them in any kind of way. I've done some testings and seems like no one can see the tickets they are participants of.

I've checked security levels of them and at least I should be able to see them, my account is jira administrator with all the privilegies to check and see everything. We are adding the users via this section on the tickets:

I would like the customer portal users to see the tickets that they are participants of. How can I make it possible?