Due to Home Assistant limitations it is possible that you will get message “401: Unauthorized” in card or panel.
Example how this error can look like in image bellow.

This issue is created by “webcard/iframe” card because it doesn’t set some cookies.
SOLUTION #
- On this URL you will find instructions to install HACS repository or JS file for manual installation: https://github.com/lovelylain/ha-addon-iframe-card?tab=readme-ov-file#installation
- When installation is done, go to HA homepage and open “Edit” mode
- Click “Add card” button and a) search for “Ingress webpage” OR b) select “Manual” card.
- In URL field put URL that you can copy from Klet3D left panel
- Final .yaml format of card and UI card setup looks like (“aspect ratio” and “title” set by your needs):
type: custom:addon-iframe-card
url: /api/hassio_ingress/73jgEvxMSTyv6TCaWNsDsSYQDSL97pwS2RmapQnAPWs/
aspect_ratio: 90%
title: test ingress web

WORKAROUND 1 (if you don’t want install HACS solution) #
You need to do this every time when you login to Home Assistant from new device -> open add-on from left sidebar.
After opening add-on on this way, you will be able to see 3D visualization in panel or card.

WORKAROUND 2 #
You need to do this every time when you login to Home Assistant from new device -> follow steps:
1. Settings
2. Add-ons

3. select Klet3D by GLAMOS

4. click on Open web UI.

After opening add-on on this way, you will be able to see 3D visualization in panel or card.