certificate not being issued

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3

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:
Screenshot 2023-12-27 at 21.35.12
to:
Screenshot 2023-12-27 at 21.35.35
and the certificate seemed to issue immediately as expected.