Can a regular modem be connected via Sfp?

Question

Mikrotik

Hello such a question. In the office there is a Mikrotik and the Internet comes from the provider. Then Sfp is connected to another office from Mikrotik to another office. And there is a signal but there is no Internet. Although if I ping the router from the 1st office, the ping passes in the 2nd office. But from that office nothing responds. Sfp is set to bridge in the same way as the rest of the ports at the L2 level