Remote connection of mobile phone and smartwatch?

I have a Huawei p20 lite and a Samsung galaxy watch active 2.

The watch and the mobile phone connect automatically via Bluetooth, but if there's no Bluetooth connection, the mobile phone does not automatically connect via remote connection.

What is the solution?

Solution: BT must be activated on both devices so that they can connect to each other

It's about the remote connection.

Also start the appropriate app?
I suppose the watch needs one