I haven't checked to see if there's a bug filed for DW to update the USER NAME tag so it can handle AO3 pseuds, but as it is DW's code is not going to play very nice with pseuds because they didn't account for that URL/naming structure.
I was hoping you could maybe fudge it using the fact that AO3 does use the /users/$USER construction, and dropping in 'EllieMurasaki/pseuds/AlexSeanchai' in as the name argument, but it looks DW's tag parser spits anything with '/'s in the name argument back as unacceptable input.
Which basically means if you want to construct a link over to AO3 that's in the usual format, you're going to have to do it from raw HTML. :/
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I was hoping you could maybe fudge it using the fact that AO3 does use the /users/$USER construction, and dropping in
'EllieMurasaki/pseuds/AlexSeanchai' in as the name argument, but it looks DW's tag parser spits anything with '/'s in the name argument back as unacceptable input.
Which basically means if you want to construct a link over to AO3 that's in the usual format, you're going to have to do it from raw HTML. :/
FWIW, this is the HTML you'd use: <span style='white-space: nowrap;'><a href='https://archiveofourown.org/users/EllieMurasaki/pseuds/AlexSeanchai/profile'><img src='http://archiveofourown.org/favicon.ico' alt='[personal profile] ' width='17' height='17' style='vertical-align: text-bottom; border: 0; padding-right: 1px;' /></a><a href='https://archiveofourown.org/users/EllieMurasaki/pseuds/AlexSeanchai'><b>AlexSeanchai</b></a></span>
Which code ought to display this for you: