Looks to me suspiciously like
Passiflora subrosa which we have in Florida growing wild as a native, and since the birds eat the fruits and then spread the seeds around vines can pop up anywhere, often on chainlink fencing.
I've tasted the ripe fruits, which are dark black-purple and look like what's in your photo and they run onto the insipid side and are neither sweet nor sour.
Another identifying characteristic is that the stem of the vine near the base is corky and tan colored.
This species is the larval food for a couple of our native butterflies here in west central Florida.
Have a look here:
https://florida.plantatlas.usf.edu/Plant.aspx?id=2080OK — HTH
Paul M.
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