Can't socket support gems into most skills.

I can't socket support gems into most of my skills: Pain Offering, Skeletal Storm Mage, Blasphemy, Skeletal Cleric, Skeletal Sniper, Skeletal Frost Mage, Fireball, Unearth were all tried. If I take an already crafted gem from my stash I can slot it in without issue, but trying to craft the gem with an uncut reports unsupported for even recommended gems. Can't craft the new gem I need because every skill I have that supports it can't craft it

1.) Not all supports can be used on all skills. If a support is incompatible with the skill it won't let you put it in/choose it

2.) You can use one of each support gem. If you already have that support gem equipped on another spell, you can't use the same support on a different spell

3.) There are support gem limits based on how much attributed you have. You might be at the cap for the color of gem you're trying to socket.

If it's none of these, then it sounds like a bug

Have same issue. It is even more wiered because when i select different gem skills the supported sometimes switch from cant socket to oh now its ok