Insync repository not signed

$sudo apt-get update && sudo apt-get upgrade 
Get:1 groovy InRelease [267 kB]
Hit:2 groovy-security InRelease                                       
Hit:3 groovy InRelease                                  
Hit:4 groovy-updates InRelease                                      
Hit:5 stable InRelease                                 
Hit:6 groovy-backports InRelease                                 
Err:7 groovy InRelease                             
403  Forbidden [IP: 80]
Reading package lists... Done
E: Failed to fetch  403  Forbidden [IP: 80]
E: The repository ' groovy InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

I’m on Ubuntu (Gnome) 20.10 and i’m unable to upgrade due to the above error. Is there any way to resolve this? I’ve tried this, but it doesn’t work. When I try this, I get the following result:

$ sudo apt-key adv --keyserver hkp:// --recv-keys ACCAF35C
Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8)).
Executing: /tmp/apt-key-gpghome.fRT7uBWPtc/ --keyserver hkp:// --recv-keys ACCAF35C
gpg: key A684470CACCAF35C: "Insynchq Inc <>" not changed
gpg: Total number processed: 1
gpg:              unchanged: 1

Hi! Could you change groovy to focal in the meantime, and let me know if that works?