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eos.io works only if you have some soft of web3 injector (like metamask). Some people will not have that installed and would want to use some other tool. If you can use EOS.io website that is probably the best way to do it:P

Sorry for the delayed reply.

Sorry, but I did not get it. I hold my EOS on Ledger Nano S and I registered it through the MEW website. I generated key on eos.io website. Is it ok then?