There is no Openwrt DHCP connection to the TTK provider, what can interfere?

Question

DHCP

Good day!
I'm trying to connect to TTC.
I choose a DHCP client in the WAN, I put the override MAC of the previous router (which, by the way, works successfully).
MTU seems to be standard 1500.
IP address is not issued, but it seems like data is being exchanged (RX, TX).
Tell me, please, what could be the reason? Maybe some other packages are needed?
UPD: it seems like the problem is in routes - static routes. in OpenWrt, they were not automatically received from the provider, and manually prescribing is a hemorrhoid. I put another firmware for half-housewives - everything started up with a half-kick.