Access Issues to Pod Logs and Terminal on OKD

[fabersystem]

Hello,
We have an OKD installation with 3 master nodes and 3 worker nodes. For the past few days, we've been experiencing a particular problem: everything works correctly, but it's not possible to access the logs section of the pods or the terminal section.

The reported error is:
[~]# oc logs podxyz
error: You must be logged in to the server (the server has asked for the client to provide credentials (pods/log podxyz))

And when we execute the command oc get machineconfigpool, the status is:

[~]# oc get machineconfigpool
NAME     CONFIG                                             UPDATED   UPDATING   DEGRADED   MACHINECOUNT   READYMACHINECOUNT   UPDATEDMACHINECOUNT   DEGRADEDMACHINECOUNT   AGE
master   rendered-master-f5b6482185c2bf508918cd2a0f0fa438   True      False      True       3              3                   3                     0                      311d
worker   rendered-worker-8380357438ac68d449d4bcfaec9bc87d   True      False      True       3              3                   3                     0                      311d

Other error messages that might be useful:
Unable to authenticate the request due to an error" err="verifying certificate SN=5145947676053765744, SKID=, AKID=80:09:0E:FD:AE:97:6F:FD:26:1B:7D:08:70:40:D6:B7:83:8F:83:DF failed: x509: certificate signed by unknown authority"

Does anyone know how to proceed to analyze the origin of the problem and resolve it?
Many thanks
bye