Welcome to Justanswer.com, my name is Dustin.I'm sorry to hear about the issue you are having, I will do my best to help you resolve it.
Bingo blitz runs through your facebook account.. So heres what you should do.
Close the Bingo Blitz app. Then, open the facebook app, now, sign out of facebook.
Then, sign back in with the same facebook account that you play bingo blitz on.. Once sign in.
Start the bingo blitz app again.. That should cause it to pick up on your facebook account and password, and you should be able to play normally.
If anything goes wrong please send a detailed reply so I can assist you further. Otherwise, if this works. Please remember to click and submit a 5star rating to show I was able to help you.
Dustin S.Senior Technician and Network Switching Systems Operator / Maintainer.