So your team is connected only with facebook ?
Your fb account is active or it was deleted ?
Did you try some things like try not only with android but with browser too ?
Uninstall and install the game ?

If you have some screenshot of your team and ID, you can ask to remove captainship here
https://nordeus.helpshift.com/a/top-...=web&contact=1

or else, some member of your asso can ask this (but after a month).