Why is there no change on the ticket status after picking the ticket in Slack?
There is a rate limit on the Slack API: it can only support changing one Slack response per second. Therefore, if you pick multiple tickets in a short period of time, the response will not change as it has exceeded the limit.
However, you could continue to chat with your customers as the live chat channel is already created.
Please also check the new channels on the left-hand side-channel list.