Mikrotik L2TP: branches can't see each other (without IPSec)?

Question

Mikrotik

Hello!
I’ll note right away that I encountered Mikrotik for the first time, please don’t “kick”.
Raised an L2TP server (I chose it, because branches with "dynamics" will be connected further) on CCR1009. Created accounts for two branches. Used the setting from this manual: mikrotik.vetriks.ru/wiki/VPN:L2TP_site-to-site_( %D...
In short, it turned out like this: There are

pings from the Main Office to Branch #1 and back and the connection is stable
From the Head Office to Branch #2 and back, pings go and the connection is stable
From Branch #1 to Branch #2 and back There are NO pings and connections NO.
I read on the Internet that you need to do OSPF on top .
A question for experts: what do I need to register and where exactly or how to raise OSPF? Do I need to remove something in the routes and routing when raising OSPF - which were specified during the configuration above?

Answer 1

if there are only 2 branches, then static routes are enough. if you want ospf - google and study

Answer 2

It is necessary to register routes.
For example, for 192.168.21.0/24 the gateway will be 172.16.30.3
and so on for each router for each network.