Hello NJ879
Good day and thanks for posting in Microsoft community, my pleasure working with you regarding the above query.
I understand that you are having an issue accessing a restored shared channel. May I know how you restored this channel? Is it through the team's app or the Teams admin center?
Also, based on your description, i notice you mentioned that you are not a member or owner of the channel, please note that, if you are not a member or owner of a private channel in Microsoft Teams, you will not have access to the channel. Private channels are designed to restrict access to only those who are explicitly added as members. This means that even if you restore a deleted private channel, you won't be able to access its contents unless you are re-added as a member or owner by someone who has the necessary permissions.
IT Admins - Private channels in Microsoft Teams - Microsoft Teams | Microsoft Learn
I suggest you should contact the owner or an existing member and request to be added. Once you are a member, you should be able to see the channel and its contents without any issues.
Thank you for your precious time and have a great day.