My subscription lapsed which caused me to be unable to view access to content that is being shared to me in a campaign.  My assumption is that this was due to the character in that campaign not flagged as one of my six characters.  Verbiage to call out why I did not have access in this situation would be useful.  Once I restored my subscription, access was restored as expected.

Content is only ever shared within campaigns. Since you did not have an active character in that campaign, the content was no longer shared.

This is already understood.