GS752TP static mac address not found in mac table

Hi,

i have started to implement port security. I have several computers that are connected via a switch in a desktop telephone to a port on a GS752TP. So the GS752TP shall learn two MAC addresses on these ports, which it does.

I converted the dynamically learned mac addresses to static mac addresses.

For one port i received an error message "error creating static MAC" (or so) for one of the two MACs.

After that, i can see only one static mac in the table of static mac addresses. But i can see both macs in the standard mac table with status "static".

Question: how do i resolve this mismatch? How can i delete the static mac that is not listed in the table of static mac addresses?

Thanks for reading

TH