That is a known AO3 bug. The sign-up form will accept them if you copy and paste them from the tagset.
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carisma_senseidancing_serpentcarisma_senseidancing_serpent
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Date: 2018-09-12 02:24 am (UTC)That is a known AO3 bug. The sign-up form will accept them if you copy and paste them from the tagset.