Server Manager problem: Online - Data retrieval failures occurred

DB2024 This is proper solution: KB article from Dell. It fixed the issue.

Step to disable the event log Microsoft-Windows-Kernel-IoTrace/Diagnostic (Apply on both nodes)

1. Log on to the target terminal as a user with administrator privileges.
2. Start Windows PowerShell with administrator privileges.
3. Execute the following command to check the current value.
   Command: (Get-Cluster).DumpPolicy
   Example execution result:
   PS C:\Users\Administrator> (Get-Cluster).DumpPolicy
   1376850201
4. Convert the above decimal value to binary (converter tools)
   The following are the values ​​in our verification environment, so please use the actual values. Decimal: 1376850201
   Binary: 01010010000100010001000100011001
5. Change the 21st value count from the right to 0 in the above binary number.
   The following are the values ​​in our verification environment, so please use the actual values. Current value: 01010010000100010001000100011001
   After change: 01010010000000010001000100011001
6. Convert the above binary value back to decimal.
   The following are the values ​​in our verification environment, so please use the actual values. Binary number after change: 01010010000000010001000100011001
   Modified decimal number: 1375801625
7. Execute the following command in Windows PowerShell started with administrator privileges. Command: (Get-Cluster).DumpPolicy=Modified decimal number
   Example execution result: PS C:\Users\Administrator> (get-cluster).DumpPolicy=1375801625 (Nothing is displayed if successful.)
8. Confirm that the changed value is output by executing the following command again.
   Command: (Get-Cluster).DumpPolicy
   Example execution result: PS C:\Users\Administrator> (Get-Cluster).DumpPolicy 1375801625
9. In Registry Editor, change the following registry data to 0 (disabled).
   Key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WINEVT\Channels\Microsoft-Windows-Kernel-IoTrace/Diagnostic
   Name: Enabled
   Type: REG_DWORD
   data: 0
10. Restart the OS, Make sure the event log Microsoft-Windows-Kernel-IoTrace/Diagnostic is disabled.

Thanks for your confirmation. Unfortunately the solution of Christian_Feuerstein  was not reproducible. I will edit my posting above to avoid further confusion. 😕