Microsoft Teams: no longer access to previous chats from Skype

I suddenly remembered I had made a groupchat (with only me in it) which I used to "save" pictures, but I am now unable to access that chat as it appears that it doesn't exist anymore.

I remember going on Teams and seeing my old chats from Skype back when the retirement was announced. This made me believe that my chats were transferred and that I would be able to access them anytime. Although, when checking it out today, nothing remained that was transferred from Skype (neither contacts nor (group)chats). Teams is just blank.

Now I do have to admit that ever since Skype retired, I did not become as active on Teams as I was on Skype (my friends and I moved to Instagram since we weren't familiar with Teams). So I do not know if Teams just opted to delete my data as I was seen as inactive. But I do wonder if there's a way to still access those lost chats or if I should just give up on the search.

Thank you in advance.