Canon R6 + lens compatibility with EF 20mm f2.8

I don't own that lens so can't help directly.

Does it come up with an error message or what else happens when you connect?
Could it be the connections are dirty?
 
I don't have this lens, so also no direct help. I do have a wide range of ef lenses and have not encountered such a problem so far. I'd try cleaning the connections as above as a first step. If that doesn't work, I'd go to canon directly to ask.
 
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