I don't have a Tubi account and am able to download from there without issue.
Mr.X
This post got me thinking? I had tried just signing out with no success. So I experimented a little and came up with this.
To download Red Green in Tubi, Fresh start Streamfab, open Tubi, sign out, shut off Streamfab, start Streamfab again, open Tubi, do not sign in, search for Red Green and download.
Cloudflare with warp fully on so not a VPN problem
Don't know what or why but it works. The really strange thing is that when signed in the several shows I tried worked fine. Thank you Mr X for your comment, it sparked the fix. Thank you to everyone who responded and tried to help.