certificate not being issued

[itergator]

Hello,
I have issued a certificate for my app to use a custom domain:

Hostname                  = www.<app-name>.com
DNS Provider              = cloudflare
Certificate Authority     = Let's Encrypt
Issued                    = 
Added to App              = 4 minutes ago
Source                    = fly

I left it running for two days and it was not issued. I have since removed it and retried as seen above. I have managed to successfully issue a certificate for just <app-name>.com. However, I did have to add and remove it a few times before it was successfully issued nearly straight away - after leaving about a day between each add/remove.

It seems (for me) to be a bit of luck whether the certificate is issued so a bit of clarification on the process would be great (or if somebody else is having the same issue).

[itergator]

as mentioned in this forum post it may be related to the port 443 not being configured. i have configured this and my fly.toml file looks like:

[build]

[deploy]
  release_command = "python manage.py migrate --noinput"

[env]
  PORT = "8000"

[http_service]
  internal_port = 8000
  force_https = true
  auto_stop_machines = true
  auto_start_machines = true
  min_machines_running = 0
  processes = ["app"]

[[services]]
  http_checks = []
  internal_port = 8000
  processes = ["app"]
  protocol = "tcp"
  script_checks = []

  [[services.ports]]
    handlers = ["tls", "http"]
    port = 443

[[vm]]
  cpu_kind = "shared"
  cpus = 1
  memory_mb = 1024

[[statics]]
  guest_path = "/code/static"
  url_prefix = "/static/"

but the certificate is still not being issued.

[itergator]

I resolved this issue by reverted to the original fly.toml:

[build]

[deploy]
  release_command = "python manage.py migrate --noinput"

[env]
  PORT = "8000"

[http_service]
  internal_port = 8000
  force_https = true
  auto_stop_machines = true
  auto_start_machines = true
  min_machines_running = 0
  processes = ["app"]

[[vm]]
  cpu_kind = "shared"
  cpus = 1
  memory_mb = 1024

[[statics]]
  guest_path = "/code/static"
  url_prefix = "/static/"

turns out my issue was spotted in a comment by @tomasztomczyk in this related forum post here.
The dns settings were being proxied through Cloudflare, I changed the @ and www records to DNS Only.
i.e. from:

to:

and the certificate seemed to issue immediately as expected.