Warning: File 'repomd.xml' from repository 'nextdns' is signed with an unknown key

Hi,

I'm using openSUSE Tumbleweed release 20240419

When I run sh -c "$(curl -sL https://nextdns.io/install)" to install nextdns, I get the following error

Looking for gpg key ID 8ACFA0B7 in cache /var/cache/zypp/pubkeys.
Looking for gpg key ID 8ACFA0B7 in repository nextdns.
 gpgkey=https://repo.nextdns.io/nextdns-armored.gpg
Warning: File 'repomd.xml' from repository 'nextdns' is signed with an unknown key '467A7CCC8ACFA0B7'.

Note: Signing data enables the recipient to verify that no modifications occurred after the data
   were signed. Accepting data with no, wrong or unknown signature can lead to a corrupted system
   and in extreme cases even to a system compromise.

Note: File 'repomd.xml' is the repositories master index file. It ensures the integrity of the
   whole repo.

Warning: We can't verify that no one meddled with this file, so it might not be trustworthy
   anymore! You should not continue unless you know it's safe.

File 'repomd.xml' from repository 'nextdns' is signed with an unknown key '467A7CCC8ACFA0B7'.
Continue? [yes/no] (no):
 

It would be appreciated if I get to know what is the issue.

Note: I have Pro (yearly plan) Subscription.

Thank You

Regards