Can't convert to compatible TT curves

This is because I’m using components? trying to export as varot

Are you using the same components in the same order throughout all masters? Try Filter > Fix Compatibility. Are your sets of anchors compatible too?
… and the Handbook Chapter about Interpolation.

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Is there a bracket layer in the ‘a’?

Is it compatible? If it doesn’t show a warning, does it warn, if you make it incompatible (add a node)?