Hello, in https://github.com/mastodon/documentation/blob/master/content/en/admin/optional/tor.md you should specify to add a row like

ALTERNATE_DOMAINS=mastodon.qKnFwnNH2oH4QhQ7CoRf7HYj8wCwpDwsa8ohJmcPG9JodMZvVA6psKq7qKnFwnNH2oH4QhQ7CoRf7HYj8wCwpDwsa8ohJmcPG9JodMZvVA6psKq7.onion

(sample domain already present in the page) in .env.production and then restart services

Thanks