Level Lock with Matter Pairing Error

I'm trying to pair my Level Lock Bolt with matter. I'm using Apple Home with HomePod Mini as the Thread Border Router. Everything works fine in Apple Home. I have paired other Matter devices from Apple Home without problems. I use the pairing code generated by Apple Home in HE Add Devices so should be doing everything right.

When I try to pair with my C8-Pro I get the following error code:

Pairing failed @ sending AddNOC operational credentials command with code 80 (Unsupported certificate format)

Any suggestions?