Network admin here, your internal IPv4 address doesn’t matter, external people don’t see it. Your work likely has a static block of external IPv4 addresses and it’s possible that they are rotated through over time so your effective external IP changes slowly. This depends on how big your work organization is and how your network admin set things up

i had a same thing going on, although i was using public university computers to do it, which is probably why they dint initially block all of them until last year. different IP, and device was confusing them. if they however detect same positng pattern, or writing style they will catch on quickly,

on another forum, i heard they "trust" iphone, google email, phone made accounts over a desktop now. it did make sense seeing as how you can have a burner device with loads of account and not get banned for having that many. of course adding some IP/proxies, anti detect in the mix.

Your company may use a NAT network. NAT network can be described as a VPN but in a more local and trusted form. What I mean is that since migration from IPv4 to IPv6 is still going on, many internet providers use 1 public IPv4 address for like hundreds of their users, thus providing both additional security/anonymity and cutting costs on equipment and its maintenance. Thus, your company may share the same public IP address with a thousand other users securing it from being banned so easily. You can check this fact by go on sites that show your IP and then compare it with the IP of a router. If they are different, then most likely you are using the NAT network.