Signature verification failed

Hi! for a week now when looking for updates I get the following error on PopOS 20.04:
W:An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://apt.insync.io/ubuntu xenial InRelease: The following signatures were invalid: EXPKEYSIG A684470CACCAF35C Insynchq Inc services@insynchq.com
W: Failed to fetch http://apt.insync.io/ubuntu/dists/xenial/InRelease The following signatures were invalid: EXPKEYSIG A684470CACCAF35C Insynchq Inc services@insynchq.com

Is there a fix for this?
Thanks!

Found a fix:
Run in terminal:
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com “EXPKEYSIG”
WHERE EXPKEYSIG IS THE KEY SHOWN IN THE ERROR MESSAGE, SEE ABOVE.

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