Why DHCP-option does not work?

Dhcp-server function is enabled at one Ethernet interface of Mikrotik Router, several DHCP option fields were included in the DHCP-Request packet sent by the client, for example option 12,host name and option 82, agent information, and at Mikrotik Router I have already added the two options at the DHCP-server interface. But Mikrotik did not contain the two DHCP-option fields in the DHCP-ACK packet.
Who can explain the phenomena?
The software version is v2.9.2.

Becasue attachments not allowed in the forum, otherwise I will upload the Sniffer.

Thank you!

Those dhcp options should be selected under “/ip dhcp-server network”:
set dhcp-option=,

Yes, I have already added the DHCP options under “network”. but in fact, Mikrotik dit not include these DHCP option tags in the DHCP protocol fields.
Anyone could help me?

I guess you have configured something incorrectly, in this case send a sniffer output file to support (where we could see the request and the response from dhcp server) and a supout.rif file with the dhcp config.

also a guess - maybe client sent DHCP option 12 as a parameter and not as a request, client has to use option 12 in Parameter-Request-List which will be sent to the server as option #55, only then server will send back the option 12