Hey - I believe this was because the Market Maker quote was worse than best bid/offer, and quote size is less than NMS which means the trade was rejected for best ex. I believe this has gone through now (with the RSP 'get quote' being at or within the BBO) but let us know
What does NMS mean? And what does RSP, BBO mean, I had the same issue to put a trade today, very annoying
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What does NMS mean? And what does RSP, BBO mean, I had the same issue to put a trade today, very annoying