CAA Enabled Domain
If your domain has CAA protection enabled, this limits who is able to create SSL certificates for it.
At SPP, we use CloudFlare, which will use one of three Certificate Authorities to create an SSL certificate for your custom subdomain.
Please make sure your domain has the following CAA records (note that some may already be present):
Record 1 (allows Let's Encrypt):
Type: CAA
Flag: 0
Tag: issue
Value: letsencrypt.org
TTL: automatic
Record 2 (allows Sectigo):
Type: CAA
Flag: 0
Tag: issue
Value: sectigo.com
TTL: automatic
Record 3 (allows Google Trust Services):
Type: CAA
Flag: 0
Tag: issue
Value: pki.goog; cansignhttpexchanges=yes
TTL: automatic