No remote desktop connection NLA problem
The remote desktop connection to the server V-APP-81-PRD was not established due to an error. The analysis showed that a no longer available RDP certificate is bound to the rdp-tcp protocol.
In fact, the certificate was revoked and then removed from the server's computer memory. For whatever reason.
Due to the RDP hardening policy, remote desktop certificates are automatically distributed in the network. For this reason, the server V-APP-81-PRD has a new RDP certificate after the withdrawal of the old certificate, but this was not bound to the rdp-tcp protocol. Why the binding (despite GPO) didn't work is not entirely clear to me. But I assume that this has to do with the withdrawal of the old certificate.