I'm also having this issue. Since the OP hasn't answered your request for information, I will.
If you could tell us about the affected operating systems and software versions it may help us understand the problem better.
Windows 11, and whatever version of the software was on your download site as of today, March 12, since I just installed it. Appears to be 126.96.36.199?
I should mention that until I can get 2 computers onto the same network, your software is completely and utterly useless, so I'd hurry and fix this if I were you. Not sure why it's still a problem 2 years later but it is.
(Between this and the whole debacle with LastPass getting breached in ways that were completely avoidable, I'm not sure I even want to bother with this but I think I can afford to give you ONE chance to fix this.)
If the client is on your account, they can be connected to the network on web with a few clicks, no join requiredments needed.
This used to be possible, but now you need a subscription in order to manager computers, even if all you want to do is join them to the network, not anything fancy like remote access. I'm not going to pay a subscription fee (Certainly not $279 a year! And that's just the "For individuals" price for 2 computers! I showed my father, with whom I'm trying to connect, and he rolled his eyes.) when I'm not even convinced the software is going to work (again, I can't get the basic features to function), much less work well enough to solve my issue.
PS: why does the forum software on this site stink so bad? There's no quote blocks, and when I'm using code block as above to work around the issue, there's no way to insert the text cursor on the outside the block. Thus, if code block is the only <p>paragraph</p> element I can't make a new paragraph outside the block.
I moved your post as you appear to be referencing (LogMeIn) Pro and not Hamachi. It sounds like you have the Pro software installed on a Windows 11 PC but you are having trouble connecting, is that correct? Can you provide more details about what exactly is happening when you try to connect? Are there any error messages?