I would suggest doing all the troubleshooting with just one R730.
1- Plug the R730 to the same port and same cable used for another AP which is already working on 1000/Full.
2- Power up AP using POE injector or power adapter and connect directly with a laptop (please verify the cable by connecting your laptop directly to the same switch port for 1000/Full).
3- If it is even failing with a verified 4 pair cable and using POE injector and power adapter, please take a fresh capture and open a support case with this information.
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