Sounds like you have a config issue with network IP addresses and netmasks.
If radio “A” is 172.16.1.1/24 then “B” should be 172.16.1.x/24 and “C” should also be in 172.16.1.x/24
I am not sure of your address scheme so adjust to meet your needs, WARNING! FLAT NETWORK DESIGN!
Management VLan ID 100
Manangement IP range 172.16.1.0/24
Devices:
TWR1-swt 172.16.1.10 255.255.255.0
“A” Master 172.16.1.11 255.255.255.0
“B” Slave 172.16.1.12 255.255.255.0
TWR2-swt 172.16.1.20
“C” Slave 172.16.1.21
“D” Master 172.16.1.22
TWR3-swt 172.16.1.30
“E” Master 172.16.1.31
“F” Slave 172.16.1.32
TWR4-swt 172.16.1.40 255.255.255.0
Each tower can have 7 more devices in this scheme. This is not an ideal design but will get you started.
Make sure you enable DHCP server below SM on each slave radio! Better yet do not block any protocols!
Make sure you have firewalls disabled and all slaves are in bridge/PTP mode
DO NOT ADD VLANS TO THE VLAN TABLES! these should be empty, only the management vlan box needs a vlan id entered.
Your switches must have the PTP radio ports in trunk mode and be vlan aware. Make sure your passing vlan100. If its a Mikrotik router, make sure you add the ports to vlan100, if cisco switch make sure you do not have any vlan allowed or vlan pruning statements on these ports!
If you need specific help, PM me with specific details and I will give you more direct answers in private.