Hot water out on tub replacement

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I am replacing my yellow tub with a white acrylic tub. I turned off the water to our bathrooms 2 days ago to start demo and have turned it back on whenever I'm not working on it. Today I determined I needed to raise the faucet to accommodate the taller tub. Figuring this would be a good opportunity to add shutoff valves, put in a ball valve and 4" piece of copper before the mixing valve.

Got everything sweated together, turned on the water, and no leaks. Try to turn on the water to the tub and have cold water but no hot water. I have hot water every other faucet on the line, but not the tub. Confused, I took apart the newly soldered components to see if I got solder anywhere or screwed up the valve, but saw nothing. Put everything back together and still have no hot water.

Very confused about this and don't even know where to start looking. Any help or suggestions would be great! Thanks in advance.
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