It that's not working it's either because of browser issue (maybe try a different one) or you didn't get this flow set to create new Lead records back in Step 38, so that value you're trying to paste in doesn't get recognized - it's only for Lead records. In that case, the best thing to do is just cancel out of the current flow you're making and start over again at Step 33 and then when you get to 38, make sure you choose Lead, like it says. Then when you get back to that Step 52, it should work (unless it's a browser issue).
It that's not working it's either because of browser issue (maybe try a different one) or you didn't get this flow set to create new Lead records back in Step 38, so that value you're trying to paste in doesn't get recognized - it's only for Lead records. In that case, the best thing to do is just cancel out of the current flow you're making and start over again at Step 33 and then when you get to 38, make sure you choose Lead, like it says. Then when you get back to that Step 52, it should work (unless it's a browser issue).
Let me know, ok?