>>107083250
Yes, I can plug it into my PC and get a public IP. It's a P2P connection and doesn't use PON.
>>107083252
https://www.fs.com/products/11603.html
>>107083417
Sorry, see my reply at the top, it's a P2P connection. When I plug it into my homemade router (a simple PC with a SFP+ card from Mellanox) it works without any problem.

Before sending this reply, I just found this review on Amazon (the 1 star one from Hunter on the 11th March 2024):
https://www.amazon.com/TRENDnet-TFC-10GSFP-Media-Converter-10GBASE-T-Schwarz/dp/B0C871SQVQ?language=en_GB#averageCustomerReviewsAnchor
Which is probably the reason why it doesn't work. Guess we now know. I think I'll buy a MikroTik RB5009, that thing only costs 60 bucks more than the converter from my previous post and I have one more excuse to buy a MikroTik device. Already got an AP and switch from 'Tik so why not.