Hello I have two orders under Assembly flows. We have IR’ed the relevant components, verified that the locations are correct, and have reallocated the stock to the desired SOs. However, i still cannot fulfill.. Any ideas ?

From my understanding, have you check for unbilled and back order as the qty isn't available to fulfil the order? Do you have 'allow overage on item fulfillments' ticked in Setup > Accounting > Accounting Preferences.