Cannot obtain the corrected message in u - center

I have connected everything using the following guide GPS-RTK Hookup Guide - SparkFun Learn. But, the message in u-center does not show up.

Ok, you’re going to need to describe exactly what you’ve physically built.
Is this using the GPS RTK 2 ZED-F9P? One of them, or two?
What’s the source of your “correction” data?
Can you confirm the receiver is getting RTCM3 packets? Use UBX-RXM-RTCM to check.
We’d need to judge where in the process this is falling down.

I am using one GPS RTK 2. The correction source network is UNAVCO data

Yes, it is getting RTCM3 packets

What RTCM3 messages are being received?
What are UBX-NAV-PVT and NAV-SIG reporting?

Try sharing a screenshot of your u-center data and a photo of your wiring/setup