Question

I can use blocks from some mods but not others

In principle, FramedBlocks supports blocks from all mods. In practice, this is significantly more complicated:

• For blocks which are considered solid, such as stone and wood, it's trivial to ensure that they are actually a solid cube
• For blocks which are not considered solid, such as glass and stained glass, such a check is not possible. Instead, the block must be tagged as framedblocks:frameable as documented on the CurseForge page. For vanilla blocks, modded blocks which are part of certain vanilla tags and blocks from a few mods, this tagging is handled in FramedBlocks itself. For anything else, this would need to be done by the other mod's author or by you adding a datapack with the appropriate tags

More specifically, the issue i'm having is some blocks from the mod Ad Astra do not work, like the iron plating and pillars

That's an issue on Ad Astra's side. They have since fixed this in version 1.15.18, so you'll have to update that.

So do I have to wait till atm9 updates then?

The fixed version is included in ATM9 0.2.49, so you just need to update the pack

Oh sorry slight typo there, i'm currently playing on atm9 no frills, does that include the fixed version?

ATM9 No Frills does not include the fixed version of Ad Astra yet.

The latest version of ATM9 No Frills (0.1.10) includes the fixed version of Ad Astra.