USW-8 SFP module question

[fiberoptics]

I recently got a USW-8 and have been toying around with it, and I got an SFP module to connect to my Edgerouter, to test it out.

Its a Deltaco SFP-C0002 which is stated to be Cisco GLC-T compatible. The switch identifies it correctly when I look at the info on the SFP 1 port, and if I plug in my router, or a computer, I get a link, but no traffic seems to be transmitted.

I know from other posts that SFP adapters can be finicky, but I expected the switch to tell me the adapter was "Unknown" or "Incompatible" or somthing like that if it didn't work.

Is my above scenario the expected result of an SFP adapter that won't work with the switch?

[Oaktech]

Is there definitely a route for traffic to pass through? Is there any ACL in place that might prevent it?