GPG key error installing GroupWise 24.2 Upgrade

Hi all,

This is an odd one. OES 24.2 server running GW 23.4, attempting to upgrade to 24.2.

After choosing to install the server components we get the following error validating the RPM, I've checked the sha256sum is correct on the tar.gz file uploaded to our server from sld.

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Installing GroupWise Server...
Shutting down [gwadminservice]                                                                                                                                                    done
Shutting down [headoffice]                                                                                                                                                        done
Shutting down [vault.headoffice]                                                                                                                                                  done
Shutting down [gwdva]                                                                                                                                                             done
redirecting to systemctl stop grpwise-ma.service
Refreshing service 'nu_novell_com'.
Loading repository data...
Reading installed packages...
Forcing installation of 'groupwise-gwha-24.2.0-145238.x86_64' from repository 'Plain RPM files cache'.
Forcing installation of 'groupwise-gwmon-24.2.0-145238.x86_64' from repository 'Plain RPM files cache'.
Forcing installation of 'groupwise-server-24.2.0-145238.x86_64' from repository 'Plain RPM files cache'.
Resolving package dependencies...

The following 3 packages are going to be upgraded:
  groupwise-gwha groupwise-gwmon groupwise-server

3 packages to upgrade.
Overall download size: 659.9 MiB. Already cached: 0 B. After the operation, 21.8 MiB will be freed.

Backend:  classic_rpmtrans
Continue? [y/n/v/...? shows all options] (y): y
Retrieving: groupwise-server-24.2.0-145238.x86_64 (Plain RPM files cache)                                                                                                (1/3), 658.6 MiB
groupwise-server.64bit.rpm:
    Header V4 DSA/SHA1 Signature, key ID feb1deecf1d670af: NOKEY
    V4 DSA/SHA1 Signature, key ID feb1deecf1d670af: NOKEY

warning: /var/tmp/zypp.ximi7U/zypper/_tmpRPMcache_/%CLI%/groupwise-server.64bit.rpm: Header V4 DSA/SHA1 Signature, key ID f1d670af: NOKEY
Looking for gpg key ID F1D670AF in cache /var/cache/zypp/pubkeys.
Repository Plain RPM files cache does not define additional 'gpgkey=' URLs.
groupwise-server-24.2.0-145238.x86_64 (Plain RPM files cache): Signature verification failed [4-Signatures public key is not available]
Abort, retry, ignore? [a/r/i] (a): a
Problem occurred during or after installation or removal of packages:
Installation has been aborted as directed.
Please see the above error message for a hint.
Shutting down [gwadminservice]                                                                                                                                                    done
Shutting down [headoffice]                                                                                                                                                        done
Shutting down [vault.headoffice]                                                                                                                                                  done
Shutting down [gwdva]                                                                                                                                                             done
Restarting grpwise.service using systemctl in the background...
redirecting to systemctl start grpwise-ma.service

Press any key to return...
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Anyone else seen this issue? This server has had successful upgrades in the past and can't find any similar issues when searching here.

TIA,
Mark.