mastodon.social is one of the many independent Mastodon servers you can use to participate in the fediverse.
The original server operated by the Mastodon gGmbH non-profit

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@ernmander@floss.social Have you asked them to search by the full URL, instead of the username. Example audiomo.online/@audiomo (including https://)

If your account has not federated with the server they are on (meaning nobody in that server already follows you) your account will not show up for searches by username. That is a Mastodon known limitation.

@downey

MastodonAudioMo (@audiomo@audiomo.online)90 Posts, 15 Following, 24 Followers · #AudioMo is a month long audio challenge that takes part in June. Record an audio a day, post the link using #AudioMo. When #AudioMo is not on we use the #Audio365 hashtag. :AudioMo: