Hello.

i have bought the Firbolg race but cant Share it with my gm. I have the: D&D Beyond Master Tier subscription.

any ideas? 
I resseted the sharring in the campaign.

Please see this handy troubleshooting FAQ for helpful tips: (https://www.dndbeyond.com/forums/d-d-beyond-general/bugs-support/142100-how-to-access-content-on-d-d-beyond-faq).

By "can't share it" are the characters that are being built in the campaign its being shared in? (the thread Sposta linked will have also mentioned this requirement)

So i cant make a toon, add it to a campaign, and share the race? 

Toon?

If you want to share the race someone in the campaign must have a Master Tier sub and that person must activate content sharing. Once that is done, all content owned by anyone in the campaign will automatically be shared with everyone in the campaign. But you must all be in that campaign.

i am having a similar issue. It seems that although i have many individual races and subclasses, players in my campaign cannot access them because i have not bought the whole sourcebook. Is this intentional? P.S i have the master sub

Quote from Deekektheaarakocra >>

i am having a similar issue. It seems that although i have many individual races and subclasses, players in my campaign cannot access them because i have not bought the whole sourcebook. Is this intentional? P.S i have the master sub

 
Ensure you subscription has not lapsed.

Turn Content Sharing off then on again.

You, and everyone in the campaign, should check entitlements are in sync: https://www.dndbeyond.com/account/licenses

Ensure everyone is making their characters in the campaign where you enabled content sharing.