Hi BobbyG,
According to your description, I know that as for your Twitter stopped working all of a sudden, you deleted the Flow and Connections and started from stratch. But now you can’t connect back to Twitter.
Firstly, could I confirm with you that if you have re-created your connection again?
I created a flow without creating a connection firstly then an error message “failed to sign in Twitter with error” occurred. Then I went to my existing connection under the Manage in Powerapps.com. And the connection status showed as “can’t sign in. update password”. I clicked Update password and provided my credentials and succeeded in connecting back to Twitter.
I also tried to create a connection firstly then to create a flow, no error message occurred.
Please try to create your connections firstly then to create a flow, in this way I think you can succeed in connecting back to Twitter.
Best regards,
Mabel Mao