Synology drive is not available for Time Machine

My iMac and DS923+ are on the same network. I wanted to use DS for Time Machine but it is not showing as available drive for backup. Is there something I have to do for that function to work?

In the Synology Control Panel, go to File Services and the Advanced Tab. Under Bonjour you’ll find the settings to enable Time Machine.

Tried it just now, enabled Bonjour via SMB (I don’t have idea what that even means) but no dice. It’s not showing on available disk list.

I just watched Will’s video about using Synology for Time Machine. I followed his settings to the letter and sure enough iMac is recognizing NAS as a backup space.
Thanks Will!