All my characters in Campaigns where the owner is Sharing Content, have suddenly had their access to that content locked and limited to Basic Rules features only.

i have an active Hero-level subscription for Beyond.

Any help to resolve would be much appreciated.

Please follow this link and ensure that your Account Entitlements are in sync: (https://www.dndbeyond.com/account/marketplace).

Thanks for reply.

Marketplace tab does show ‘account entitlements are in sync’.

Could it be something else?

Are all of those campaigns benefiting from content sharing by the same individual? If so, has their Master Tier Subscription expired?