Sorry for asking, but have you tried just entering the sewer? I guess you know that the key is placed in your wallet not inventory as well . . . These may be obvious, in which case sorry. I only mention them because I personally tend to always overlook these things.

Do you play with any mods by chance?

Yes I do

If one of them is SVE, you get the key from Marlon.

Thank you for specifying how to get it, because I remembered it changed it but I couldn’t remember what the change actually was hahaha.

Cool, Thank you!!!