Multisim error 3010 when activating on Samsung Watch 9

I have a Samsung Galaxy S24 Plus and a new Samsung Galaxy Watch 9. When I try to add MultiSIM through the Galaxy Wearable app, activation fails with error 3010.

I have already been through several line supports and the shop:

• Called KPN → sent to a store
• Went to the store → sent back to the hotline
• Restarted phone and watch
• Factory reset the watch
• Reinstalled the Wearable app
• Repeated the official MultiSIM activation steps

None of that changed anything.

This is a known issue on the KPN Community. 

KPN suggested I take it to Samsung as a possible hardware fault. That does not fit the facts:

• The same watch works with Odido on a friend’s phone
• The combination is a supported Samsung phone + LTE Galaxy Watch
• Error 3010 is documented many times as a provisioning / backend error, not a broken watch

So this is a KPN account/provisioning problem, not a Samsung hardware problem.

I now have a ticket with a technician. I will wait for that.

Please do not reply with “reset the watch / reinstall the app / follow the standard activation steps.” I have already done that, more than once, and I asked KPN staff not to post those answers again.

If anyone got past 3010 after the usual steps failed, I would like to know what actually worked.