Hi @Bradbpw
You don’t need to Disable PBX Firewall. Just you need to check some steps and allow ports from PBX Firewall.
1- Admin --> System Admin --> Port Management --> LE Port change Enable it to 80 --> PBX GUI Port HTTP(S) Enable HTTP-8080 and HTTPS-443
2- Connectivity --> Firewall --> Services --> Extra Services --> Let’s Encrypt Select --> Internet / Local and Other --> Save and Apply
3- Follow @jerrm steps.
Thanks.
Shahin