Hi, I'm running a SpongeForge server 1.12 running modpack PO3 kappa mode and I can not get the attunement altar to form properly.

I've checked the structurematcher.dat and I can see that the structure is recognised and the tag isMatching is 1 which I can only assume is True for structure astralsorcery:pattern_attunement_frame.

I can not see any issues when checking the logs in this regard so I'm kinda stuck as to what the issue could be, I have a feeling that sponge may be interferring but my questions are a)can I fix this or b)Can I force a player attunement or additionally force the structure into being.

Sponge has interfered in the past, but if you're running an updated version of sponge that should no longer be an issue.

Right click the altar block with a sextant to reveal if any blocks in the multiblock are placed incorrectly (or missing). If that reveals no issues, shift-right-clicking in creative mode will forcibly build the structure for whatever block you've clicked. There is also a command for this, which can be referenced using /as help in-game when sufficient permissions are granted.

Thanks, the sextant thing worked in theory but the structure was correct to begin with. I can't really update the sponge forge as it's the highest version for the modpack it can run on. The /as commands helped me to force the progress though and I can at least create a trade system for spawning in attuned items. Many thanks for the help.