Consequence of creating a site to site VPN with customer using a blacklisted IP address

Consequence of creating a site to site VPN with customer using a blacklisted IP address
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I am trying to establish a site to site vpn with a customer. I looked up the peer IP address and discovered that the public IP has been blacklisted with reference to a reputable source. What do you think?

i.e the peer IP (Public) has bad reputation)