I've just had to rebuild my PC (calamitous mess from Microsoft with Win10/Win 11 'upgrade' - they confirmed I had to start with a new build).  I have used Zoho mail for years via Mozilla Thunderbird, but now I've had to download the latest version of TBird, I can't log into my Zoho mail with my normal password (which continues to work fine on the web version of Zoho) nor with the Application Specific Password I have used before.

What do I need to do to get back to using Zoho mail via Thunderbird, please?