HomematicIP Cloud setup fails silently (popup disappears immediately)

Configuration
1

Hi everyone,

I’m trying to set up my Homematic IP Access Point via the official “HomematicIP Cloud” integration in Home Assistant, but I’m stuck.

My setup:

  • Home Assistant Green (Home Assistant OS, up to date)
  • Homematic IP Access Point (older model, HmIP-HAP)
  • Network: Access Point and Green box are both on the same router/switch

What happens:

  1. Settings → Devices & Services → Add Integration → “HomematicIP Cloud”
  2. Enter SGTIN (left Name and PIN blank, since no user account management with PIN is active)
  3. Confirm → prompt appears asking to press the blue system button on the Access Point
  4. Right after that, the popup disappears again (“flickers” briefly) — with no error message

What I’ve already checked/tried:

  • Checked Settings → System → Logs after the incident (including filtering for “homematic”) → no entries at all
  • Power-cycled the Access Point → same behavior
  • Tested the system button independently (started the reset procedure up to the fast orange blinking, then stopped) → button and LED work fine, so no hardware defect
  • Homematic IP App still works normally, devices can be controlled through it
  • Tried both via the Home Assistant mobile app and via browser on a PC → same behavior
  • Checked for old/stuck config entries for HomematicIP Cloud → none present

Question: Does anyone know how to get real error details when even the logs show nothing? Or does anyone know a fix for this behavior?

Thanks a lot for any help!

3

Thanks a lot for the detailed reply! I went through everything you suggested:

  1. Same L2 segment: Confirmed — Access Point and Green are both on the same router/switch, no guest WiFi or client isolation.
  2. Power cycled the HAP: Done multiple times, including a full factory reset of the Access Point button sequence (blue button held until orange blink) — button and LED work perfectly fine, so no hardware issue there.
  3. Blank name/PIN: Tried, same result.
  4. Watching home-assistant.log live: I kept the Logs page open (filtered for “homematic”) while submitting, and refreshed right after clicking — absolutely nothing shows up, not even an INFO line. Also checked the browser dev console (Chrome) for JS errors during the popup — nothing there either. It’s a completely silent failure on both ends.
  5. Official app pairing first: I couldn’t find any pending cloud-pairing step in the app (checked Settings for anything related to connected services/remote access) — the app itself works perfectly, I can control all devices through it.

Also checked router-side (FritzBox): correct access profile, no DNS-rebind rules, no QoS throttling, tried disabling IPv6 (no change, re-enabled it). Router event log shows nothing unusual either.

At this point it really seems like the popup just silently aborts without logging anything anywhere I can see. Would love any pointer on how to get more verbose debug output specifically for the homematicip_cloud config flow — is there a way to bump logging level for just that component before hitting submit?