Hi,
I have seen some similar threads and most of them use netsh interface ip delete arpcache
as a workaround.
For the command of arp -d * didn't work, you may try some general steps:
1.Run sfc /scannow to repair any corrupted system files.
2.Do a clean boot and check if arp -d * can work. This can narrow down whether the issue is related with the third-party software.
3.Create a new user account and login with new account, see if the command can work.
If the above steps still didn't work, then we need to trace some log to find the cause. However, analysis of log is beyond our forum support level and due to forum security policy, we have no such channel to collect user log information. So, if you want to find the cause, we recommend you open a case with MS Professional tech support service, they will help you open a phone or email case to Microsoft, so that you would get a technical support on a one-to-one basis while ensuring private information.
Here is the link:
https://support.microsoft.com/en-us/gp/customer-service-phone-numbers
Best Regards,
Candy
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