I'm playing a level 4 Sorcerer and bought the Aberrant Mind subclass but the psionic spells such as  Arms of Hadar, Dissonant Whispers, Mind Sliver, etc are missing from my already known spells. My character sheet is only showing Calm Emotions and Detect Thoughts as my known psionic spells. Is there a solution to this issue?

Those spells need to be purchased separately.

Those 3 spells are not free. You'll need to purchase the first 2 from the Player's Handbook and Mind Sliver from Tasha's.

Thank you all for the responses. I'm pretty flabbergasted that they there's no description to specify that would be case if purchase the subclass by itself. It gave me the impression that the subclass would include all spells. That's really disappointing but lesson learned from now on. 

I have purchased the spells and they are missing for me as well. They weren't missing from my old character created a year ago but when creating new characters, even homebrew versions the lvl 1 spells + mind sliver wont show up.

I also have them purchased and they are not showing up for me either.

I'm having this same issue. Anyone ever discover a resolution / fix to this?

See post #2 in this thread.

Thank you for the responses. However, I have purchased Tasha’s Cauldron of Everything and the related spells. It appeared initially when I created it as a DM, but now that the player claimed the character, the spells disappeared form the sheet! I can still learn them, but the class give them additionally! so they should be there. I have activated the content shared... so, I don't know.

Thanks in advance for any help!

You and your player should double check that your Account Entitlements are in sync: (https://www.dndbeyond.com/account/marketplace).

It says: Your entitlements data is in sync! You should have nothing to worry about, but contact our Support Team if you're having problems accessing your purchased content.

Thanks for the suggestion... I guess it is something related to that, maybe some server synchronisation. We just created the character, and he claimed it... so, perhaps it takes some time. He also did it from the phone app, so... who knows? We will wait until tomorrow; if not, then, Support Team it is!

I appreciate your help!

Have your player check their entitlements too. And try turning content sharing off and back on again.

We both had it synced. This morning, everything was fine. I think it was just a time sync... delay

Thank you.

I am experiencing this issue now. Both synced, all content open. Unshared then reshared. Both logged off and then in again. Can't get my players character to show the spell properly.