There has been many issues with Astral Sorcery. At this point we are unsure what is causing the problem.
We have tried many attempts, which include; Re-installing the mod, copying over working versions from other modpacks, coping over complete configs and mod files from other packs.
No success, it could be mod interaction or some other variable. This being said, the linking tool (offered at spawn) will allow you to connect crystals to tables and if you begin with the first step, discoveries will be unlocked.