The following are the Zero touch mesh limitations.
Zero-touch mesh only supports 5Ghz
Zero-touch mesh only supports Solo AP 110+ and SZ AP 5.0+
When Solo AP upgrades from previous release (for example 104 or 106) to 110, AP needs a set factory option to activate zero-touch mesh
When Solo AP has the updated configuration (for example, WLAN configuration update), the AP needs a set factory option to activate zero- touch mesh