Quarq Rival AXS not reporting Wattage

Looking for help with a Quarq Rival AXS power meter.

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The power meter reports cadence normally but won't display any wattage. I've already tried zeroing it, calibrating it, setting the offset, changing the battery, forgetting and pairing back to SRAM app, and removing/re-adding it to my head unit.

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I contacted SRAM support and sent them screenshots of the zero offsets. They said the offsets looked normal, but the fact that it reports RPM while the bike is sitting still is unusual. They suggested it may be an internal strain gauge issue.

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Unfortunately, I bought the bike secondhand and don't have the original receipt, so warranty coverage likely isn't an option.

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Has anyone experienced this before or found a fix? Is there anything else I should try before replacing the power meter?

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