Thanks @Ca6ko for your help,
Have you looked in the MESH section by connecting to the main Audience via winbox?
I looked at this section in Winbox and it was surprisingly empty, suggesting that the QuickSet config may have not properly configured the Mesh controller unit.
How to reset the device to factory settings is shown in the manual, press the Reset button before power on and release it when the LED flashes.
The second way is by connecting through winbox to enter the system / reset the configuration.
I tried both of these reset procedure and when going through Winbox, I tried bit with the option "Keep default configuration" checked and unchecked.
I tried those procedures both with RouterOS 6.49.6 and 7.5.0.
Unfortunately, none of these solutions worked so I opened a support ticket with Mikrotik.
If you managed to connect the repeater devices to the main one, it means that the wps button still works?
I connected to the repeaters using an Ethernet cable on ETH2 and was assigned an IP address, I can connect both with Winbox and the web admin console.
I'm waiting for the guidance of Mikrotik support, looking for a solution to properly reset my units to factory settings and then try a clean slate setup with RouterOS 7.5.0 or trying any procedure I would be recommended to follow.