I believe the mods were aware of the bug that wouldn’t allow this mastery to be completed. A post was made, and closed by a mod 28 days ago.
Has this been fixed? If not, do you have a timeline?
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Just noticed the same after trying all the combinations mentioned in posts all over the 'net aged last month - appears to still be an issue. Issue was documented as tracked on the Known Issues & Solutions page 25 May and, as you’ve mentioned, the original bug report was closed by a moderator shortly after, doesn’t look to be fixed yet 
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I’ll almost always close threads if we have enough information so I know what has been responded to.
That said, I think a fix for this one is coming with our Season 2 update.
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