Limit access to collabora server

My YunoHost server

Hardware: VPS bought online
YunoHost version: 4.3.6.2
I have access to my server : Through SSH | through the webadmin

Description of my issue

I installed Collabora server on a subdomain and Nextcloud on another subdomain.
On installation Collabora server I had to set an administrator password.
After enabeling the ‘Nextcloud office’ app I could add my server to Nextcloud without filling out a password.
Everything seems to work fine.

This does not seem right. Anyone who knows https://collabora.mydomain.com could make use of it? How to limit access to this domain so it can be used only by my nextcloud installation.

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