Well… I feel very stupid…
I never noticed the add remote option from the web UI.
entities → bluetooth → add bluetooth.
RTFM i guess.. https://support.unfoldedcircle.com/hc/en-us/articles/14695799302940-How-to-pair-with-a-Bluetooth-LE-device
It worked after enabling the pairing mode on the remote.
I feel extremely stupid…
Thank you for the help <3