Error: MAC address is invalid

Expected Behaviour:

Static DHCP leases configuration allows generated MAC addresses for LXC and VM

Actual Behaviour:

WebUI shows error: MAC address (83:C8:91:DF:04) is invalid!

Question:
Why is Pi-hole showing an error for generated MAC addresses?
Which MAC addresses are not allowed?

I replied to the GitHub issue on this but it's the same problem. You are missing an octet on your MAC address.

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OK I had the same problem. I copied the mac adresses with the "-" signs. Dont do that!!!

00-1E-1F-D6-6F-GB Just type 001E1FD66FGB

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