To rule out an issue with physical port, you can try using the same SFP on the other ports say et-2/1/1 or et-2/1/2 and verify if the optic comes up. If SFP comes up in other ports and not on this specific one, you may want to perform loopback testing.
Just a thought, can you try using a spare optic and inserting it into that port?
Idea is to check if this QSFP is support or not. If you could insert a say working QSFP from the other PIC into port et-2/1/0 it would confirm the same. PS: We might have to reboot PIC once we have the QSFP inserted.