I apologise if this was posted before, I can't see a thread related to it and I used the search function.

We have the Master tier subscription, with the DM owning the players handbook.

By the description of this sub "allows you to share all of your unlocked official content with other players within your campaigns so content does not have to be unlocked individually." We understood this as all players would be able to use everything from the PHB. When a player tries to spin up his character in the builder, he has limited options - specifically feats.

 
Have we misunderstood how this sharing should work?

Cheers

Is the player building the character within the campaign? And is campaign sharing turned on for that campaign?

On the campaign page, be sure to have checked the box "Enable content sharing", on the top left.

You got it in one thank you, campaign sharing was not enabled. Any easy way to mark this as solved?

Quote from bridgeburner >>

You got it in one thank you, campaign sharing was not enabled. Any easy way to mark this as solved?