Hello friends, I have 3 RB100Ahx2, of which one is logging "DHCP / Warnig offering leases", all 3 have the same configuration, same OS version.
I have 100 clients without being able to connect to my DHCP

Please your help

- If you have a bridge, DHCP should be tied to the bridge instead of interface

Use Tools > Packet Sniffer on the Mikrotik, and Wireshark on the PC. Do an IP renewal. With this you'll see if DHCP packets are being lost, and you'll see if the client is rejecting the offer. Or maybe you'll find a second a DHCP service on the network. Clients may reject an offer if they detect the IP is already in use on the network.

If you run your DHCP server on a bridge, try to disable STP/RSTP on that bridge...