Two WAN connections - Single SSL certificate?
I have a TZ350 which has two WAN connections. We'll say that AT&T service has an external IP address of 188.8.131.52 and spectrum has an external IP address of 184.108.40.206. Through my DNS provider, I have assigned an A record for ATT.mydomain.com which points to 220.127.116.11 and another A record for SPECTRUM.mydomain.com which points to 18.104.22.168
Since the connections are comparable in speed, I'd like for the end users to be able to use either one when using SSL VPN. As it is now, I have installed a sectigo essential ssl certificate for att.mydomain.com and it's working properly. However, users who access the SSLVPN through spectrum.mydomain.com naturally get certificate errors.
What is the preferred way to install a single certificate onto the TZ350 which would apply to both WAN connections?