Mahindra 1538 Backhoe Attachment not getting pressure

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Hooked up the backhoe attachment on my Mahindra 1538L tractor today. It worked just fine for a minute or two, just long enough to begin to position it for the mechanical connection. Before I got it lined up to put the pins in, I lost all hydraulic pressure to the backhoe. I’ve verified fluid level, and triple checked the hose hook-up. I should say that I’ve used the backhoe attachment several times a year since 2016, so it’s not new, but this is the first time this has occurred. Front end loader still functions normally, as does the rear lift, so the pump is functioning. I just wanted to see if anyone here has seen this problem before I start troubleshooting in depth.