How to clone the mac address of wan?

I have already seen and tried add option macaddr 'xxx' in part of wan in /etc/config/network but both methods have no effect.

How did you check that the options do not have any effect? Did you restart networking and/or your router after applying the changes?

Please copy the output of the following commands and post it here using the "Preformatted text </> " button:
Remember to redact passwords, MAC addresses and any public IP addresses you may have:

cat /etc/config/network
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no effect how ?

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Sorry, I made a mistake. The mac address of wan has been cloned. But I still can't use PPPoE. It can be done with Xiaomi router. It seems to be another problem.