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Please delete the duplicate posting of your issue in another thread. Double-posting is discouraged in this forum.
It appears from your description that there is something about your specific account is causing this difficulty, so there isn't much help you are likely to get from this forum. It isn't obvious from your post whether you were trying to send from the Fastmail web interface, the Fastmail mobile app, or a third-party email client (such as Apple Mail, Thunderbird, or Outlook). If you are using an email client, you of course need to have your outgoing SMTP set up to use the proper Fastmail SMTP server and use an App password you created specifically for that email client.
Of course, you might also log into your Fastmail account and check a few things. In Billing & Plan you can see when your account renews. In Password & Security you can see your logged in sessions and App Passwords. If you suspect fraudulent activity you might want to disable or remove any existing App Passwords and change your main login password.
Bill
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