Thank you for your reply, i'm glad to see it))
For the issue with dhcp server:
The same network, i've seen that issues is actual only for 5GHz networks
Mikrotik is saying that "sep/18 00:38:08 dhcp,warning dhcp1 offering lease 172.24.0.68 for A4:5E:60:18:FA:4F without success", and dhcp lease is in "offered" state.
I've tryed another dhcp server - tfpd64, and here what i've get:
A4:5E:60:18:FA:4F - is my iphone (5GHz AC)
Rcvd DHCP Discover Msg for IP 0.0.0.0, Mac A4:5E:60:18:FA:4F [18/09 00:41:08.720]
IP address 172.24.0.10 flushed from ARP table [18/09 00:41:08.721]
DHCP: proposed address 172.24.0.10 [18/09 00:41:12.836]
Rcvd DHCP Discover Msg for IP 0.0.0.0, Mac A4:5E:60:18:FA:4F [18/09 00:41:12.839]
IP address 172.24.0.10 flushed from ARP table [18/09 00:41:12.839]
DHCP: proposed address 172.24.0.10 [18/09 00:41:16.953]
Rcvd DHCP Discover Msg for IP 0.0.0.0, Mac A4:5E:60:18:FA:4F [18/09 00:41:16.955]
IP address 172.24.0.10 flushed from ARP table [18/09 00:41:16.956]
DHCP: proposed address 172.24.0.10 [18/09 00:41:21.071]
Rcvd DHCP Discover Msg for IP 0.0.0.0, Mac A4:5E:60:18:FA:4F [18/09 00:41:21.073]
IP address 172.24.0.10 flushed from ARP table [18/09 00:41:21.074]
DHCP: proposed address 172.24.0.10 [18/09 00:41:25.188]
Rcvd DHCP Discover Msg for IP 0.0.0.0, Mac A4:5E:60:18:FA:4F [18/09 00:41:25.190]
IP address 172.24.0.10 flushed from ARP table [18/09 00:41:25.191]
DHCP: proposed address 172.24.0.10 [18/09 00:41:29.305]
Rcvd DHCP Discover Msg for IP 0.0.0.0, Mac A4:5E:60:18:FA:4F [18/09 00:41:29.307]
IP address 172.24.0.10 flushed from ARP table [18/09 00:41:29.308]
DHCP: proposed address 172.24.0.10 [18/09 00:41:33.424]
Rcvd DHCP Discover Msg for IP 0.0.0.0, Mac A4:5E:60:18:FA:4F [18/09 00:41:33.426]
IP address 172.24.0.10 flushed from ARP table [18/09 00:41:33.427]
DHCP: proposed address 172.24.0.10 [18/09 00:41:37.543]
Rcvd DHCP Discover Msg for IP 0.0.0.0, Mac A4:5E:60:18:FA:4F [18/09 00:41:37.545]
IP address 172.24.0.10 flushed from ARP table [18/09 00:41:37.546]
DHCP: proposed address 172.24.0.10 [18/09 00:41:41.660]
Rcvd DHCP Discover Msg for IP 0.0.0.0, Mac A4:5E:60:18:FA:4F [18/09 00:41:41.662]
IP address 172.24.0.10 flushed from ARP table [18/09 00:41:41.663]
DHCP: proposed address 172.24.0.10 [18/09 00:41:45.778]
Rcvd DHCP Discover Msg for IP 0.0.0.0, Mac A4:5E:60:18:FA:4F [18/09 00:41:45.780]
IP address 172.24.0.10 flushed from ARP table [18/09 00:41:45.781]
DHCP: proposed address 172.24.0.10 [18/09 00:41:49.895]
60:45:BD:EB:92:CA - is my Surface (5GHz AN)
Rcvd DHCP Discover Msg for IP 0.0.0.0, Mac 60:45:BD:EB:92:CA [18/09 00:45:59.260]
Client requested address 172.24.0.75 [18/09 00:45:59.261]
IP address 172.24.0.15 flushed from ARP table [18/09 00:45:59.300]
DHCP: proposed address 172.24.0.15 [18/09 00:46:03.415]
Rcvd DHCP Discover Msg for IP 0.0.0.0, Mac 60:45:BD:EB:92:CA [18/09 00:46:03.417]
Client requested address 172.24.0.75 [18/09 00:46:03.418]
Freeing item 172.24.0.15 60:45:BD:EB:92:CA [18/09 00:46:03.418]
IP address 172.24.0.15 flushed from ARP table [18/09 00:46:03.489]
DHCP: proposed address 172.24.0.15 [18/09 00:46:07.605]
Message truncated (length was 8) [18/09 00:46:07.607]
Rcvd DHCP Discover Msg for IP 0.0.0.0, Mac 60:45:BD:EB:92:CA [18/09 00:46:08.241]
Client requested address 172.24.0.75 [18/09 00:46:08.242]
Freeing item 172.24.0.15 60:45:BD:EB:92:CA [18/09 00:46:08.242]
IP address 172.24.0.15 flushed from ARP table [18/09 00:46:08.287]
DHCP: proposed address 172.24.0.15 [18/09 00:46:12.401]
Message truncated (length was 8) [18/09 00:46:12.403]
Rcvd DHCP Discover Msg for IP 0.0.0.0, Mac 60:45:BD:EB:92:CA [18/09 00:46:16.740]
Client requested address 172.24.0.75 [18/09 00:46:16.741]
Freeing item 172.24.0.15 60:45:BD:EB:92:CA [18/09 00:46:16.741]
IP address 172.24.0.15 flushed from ARP table [18/09 00:46:16.806]
DHCP: proposed address 172.24.0.15 [18/09 00:46:20.923]
Message truncated (length was 8) [18/09 00:46:20.925]
Rcvd DHCP Rqst Msg for IP 0.0.0.0, Mac 60:45:BD:EB:92:CA [18/09 00:46:23.669]
After about 2-5 minutes Surface is recieving adress, but iphone is needed about 15 minutes to recive address
Both of them were connected to 5GHz network, on 2GHz network i have no issues
In the same test on Ubiquiti UAP AC LR - no issues
In the same test on Mikrotik HAP AC - no issues
Only one solution has been found - in configuraton of 5GHz radio need to set channel width to 40 MHz
After it - no issues
Test in progress...