I bought multiple sourcebooks for my campaign so my places can access a majority of the the available races but they can select any of the new races that came with the books i bought

Do you or one of your players have a master tier subscription and have enabled content sharing in the campaign you're all in? That's required too allow your players to access your books

oh no none off us have a subscription can i enable sharing myself without a subscription?

You can't share content without at least one player having a master tier subscription

I have this problem, but myself and another DM both have master tier. Why can’t our players see the additional races?

Same here. I have Master Tier and have everything shared. 

Quote from AudruneCastleruner >>

Same here. I have Master Tier and have everything shared. 

• Did you actually activate content sharing for that campaign?
• Are your players actually creating their characters specifically within that campaign?
• Are your Account Entitlements in sync: (https://www.dndbeyond.com/account/marketplace)?

Yes. One of my players didn`t create the character on my campaign link. I also deactivated and re-activated the character. 

Your players can only access that content specifically within that campaign, not elsewhere. Try turning content sharing off and back on again.