Check your logs on HA, they might reveal whether it’s caused to IP-ban, credentials or “not allowed subnet”
Another site ?, or Home on same Router ?, somehow you need to be more specific how you have your network setup ( even thou it might sounds “Cool” with “another site”, it’s pretty different than connected on same router, different subnet )
… Anyhow you could maybe use HTTP: integration and add "
ip_ban_enabled: true
ip_ban_whitelist:
- 192.168.20.0/24