DNS hosted by Dyn unable to accept the TXT Record name "@"

Hi.

I use Dyn (dyn.com) DNS services for one of my domains.

When trying to add a TXT Record in Dyn, it's unable to accept the "@" for the name or host name of the TXT Record.

Error message:
"You should enter valid hostname label."

Is there an alternate option besides using "@" that can be used? Like perhaps "keybase"?

I confirmed "keybase" is accepted.

No repository files, tests, or entry points are mentioned. Begin by checking how Keybase expects DNS TXT records and whether the Dyn provider's handling of the @ host is documented; done means documenting a supported hostname or confirming that no alternate exists.

Written by the indexing model from the issue text.