Pi-hole would not prevent a client from joining your local network, even if it was configured as DHCP server.
Assuming you are suspecting Pi-hole to somehow prevent your Helium miner to join a remote(?) Helium network: Pi-hole could only come into play here by blocking a domain that would be required to resolve properly in order for your Miner to log into that Miner network.
If that's the case, the debug log won't help.
Instead, you should scrutinise your Pi-hole's Query Log for blocked domains during the attempted login.
To that end, the following may also prove useful: