Sonys Press conference from MWC took place end of February
If you missed it you can watch it here.
Please join the discussion here and share your thoughts on what was anounced here.
MWC 2019 discussion.
I had the same issue, none of the suggestions worked for me. In my case, I believe it was because I moved from the UK to Ireland, but I'm not sure of that. I did fix it by going to "Settings" > "Accounts & Sync" > "Xperia" > "Options" (three dots on top-right) > "Remove account".
Then, I just opened Lounge again and logged in with the same account, and presto!