Hello, @Raymond_Woodley
You added only one custom domain and today add another domain fleetinform.com.
I added the domain to the existing certificate for www.fleetinform.com.
now you should have everything working correctly.
Externack check:
https://www.ssllabs.com/ssltest/analyze.html?d=fleetinform.com&latest
Please note that the domain mount to backendless servers with the help of A record to our IP address. Our IP can changed, in which case you will need to change it manually.