This question comes to me because since we cannot hop through instances (AKA transfer from one instance to another your account) I’d like to create an account into another instance, for research purposes, but if this ‘feature’ comes in a near future I’d love to bring my main account to said instance, preferably with the same username and if I have it “mirrored” (same username) I think that’d make it impossible.
From my understanding it should be possible, I think that’s the case with many communities/sites, but I’m not sure here.
I hope I’m being clear.
I think this is what OP is asking. After a bit of searching, I found this post from the other day, which says that the usernames do not become available
https://lemmy.world/post/62889
Though maybe this is a server setting and varies between instances? (Also, I don’t know if that is the “correct” way to link to another Lemmy post, so apologies if that is wrong)