===== Include CA certificate of SMT server on SUSE 15 GCP =====
<code>
/usr/sbin/registercloudguest --force-new
[SSL: CERTIFICATE_VERIFY_FAILED] 
server:~ # certtool -i < /var/lib/ca-certificates/ca-bundle.pem | grep suse-public-cloud@susecloud.net
        Issuer: EMAIL=suse-public-cloud@susecloud.net,CN=SUSE,OU=CSM,O=SUSE,L=Nuremberg,ST=Bavaria,C=DE
        Subject: EMAIL=suse-public-cloud@susecloud.net,CN=SUSE,OU=CSM,O=SUSE,L=Nuremberg,ST=Bavaria,C=DE
                        RFC822Name: suse-public-cloud@susecloud.net
                        RFC822Name: suse-public-cloud@susecloud.net
server:~ #
server:~ # ls /etc/ssl/certs/*SUSE*
/etc/ssl/certs/SUSE.pem
server:~ #
wget http://smt-gce.susecloud.net/smt.crt
cp smt.crt /etc/pki/trust/anchors/smt.crt
update-ca-certificates
server:~ # certtool -i < /var/lib/ca-certificates/ca-bundle.pem | grep suse-public-cloud@susecloud.net
        Issuer: EMAIL=suse-public-cloud@susecloud.net,CN=SUSE,OU=Public Cloud,O=SUSE,L=Nuremberg,ST=Bavaria,C=DE
        Subject: EMAIL=suse-public-cloud@susecloud.net,CN=SUSE,OU=Public Cloud,O=SUSE,L=Nuremberg,ST=Bavaria,C=DE
        Issuer: EMAIL=suse-public-cloud@susecloud.net,CN=SUSE,OU=CSM,O=SUSE,L=Nuremberg,ST=Bavaria,C=DE
        Subject: EMAIL=suse-public-cloud@susecloud.net,CN=SUSE,OU=CSM,O=SUSE,L=Nuremberg,ST=Bavaria,C=DE
                        RFC822Name: suse-public-cloud@susecloud.net
                        RFC822Name: suse-public-cloud@susecloud.net
server:~ # ls -l /etc/ssl/certs/*SUSE*
-r--r--r-- 1 root root 1891 Jan 17 11:19 /etc/ssl/certs/SUSE.1.pem
-r--r--r-- 1 root root 2167 Jan 17 11:19 /etc/ssl/certs/SUSE.pem
server:~ #
/usr/sbin/registercloudguest --force-new
server:~ # SUSEConnect --status-text
Installed Products:
------------------------------------------

  SUSE Linux Enterprise Server for SAP Applications 15 SP2
  (SLES_SAP/15.2/x86_64)

  Registered

------------------------------------------
(blablabla)
</code>

==== Note ====
Is temporary fix... that will help you to get out of the problem... but I don't know what will happen when the certificate expires, maybe you will need to remove the crt from the path after you get a correct resolution.

==== References ====
  * https://medium.com/google-cloud/tips-and-tricks-for-os-registration-patching-maintenance-on-suse-linux-enterprise-server-for-sap-4627ca370f3