Pair with a nursery
Somebody shared an EarHorn pairing link with you, or you scanned the code on the nursery phone.
If EarHorn is installed on this phone, the link you tapped should have opened it directly. If you are reading this instead, the app is not on this phone yet, or your phone has decided to open EarHorn links in Safari.
Get EarHorn
EarHorn is coming to the App Store. Until then, the person who shared this link can send you an invitation to the test version.
After installing
Scan the code on the nursery phone again with your phone's Camera app, or ask for the link to be sent again. A pairing link works for fifteen minutes and cannot be carried through an install, so a fresh one is needed once the app is on your phone.
If EarHorn says the link arrived without its details
Something between the two phones removed the end of the link, which is the part that does the pairing. Lockdown Mode does this, and some message and mail apps rewrite links the same way. The link was complete when it was sent.
Scan the code on the nursery phone with your Camera app instead. Nothing can be stripped from a code you point a camera at, and it works with Lockdown Mode on. Typing the 8-character code shown under the QR works too.
If the link keeps opening in Safari
Your phone remembers a choice to open EarHorn links here instead of in the app. Touch and hold the link where it was sent to you, then choose Open in EarHorn. Or open EarHorn, choose the parent role, tap Enter a code instead, and type the code shown under the QR on the nursery phone.
What this link is
It carries the nursery phone's address on your home network and a one-time secret, and it lets a phone pair with that nursery for fifteen minutes. Treat it like a key: do not forward it, and do not post it anywhere.