No chats in messenger

Hello

i Hope someone can help. I have deleted the messenger app, reloaded it, signed in and out of Facebook, changed password, download most recent iOS and still I cannot see any of my chats or calls on my iPhone or iPad. My iPad shows me I have a message with notifications but then when I go into the app I just see a blank page with the loading symbol. This happens on wifi and 5g. Any advise would be greatly appreciated ????