Hint, while the remote is a battery operated device, keep it from going into sleeping mode, by pressing the pair button every other second during the pair process.
How? Do you own an Eglo zigbee hub as well? Just curious.
And please try to post in the appropriate app topic.
When searching for ‘app eglo’ I got this app topic as result:
You can also send the developer an email message, contact info is present at the app page @ homey.app store!