My son has an Ipad and has been playing Dragon city on that. I have now set up a new email address and a new facebook account and associated it with the Dragon City on his Ipad. Years ago we used to play it and I was recently able go back to the game that was under a different facebook account. As our old game was significantly higher in respect of the levels, he wanted this version on his Ipad. On the change player part of the app on his ipad there is no way to enter the facebook details from the higher level version of the game, yet on my old android tablet app I can easily switch between the facebook accounts as the app allows me to actually enter the log in details for whichever facebook account i wish to use. Is this a problem only with IOS because it's driving me nuts not being able to do something as simple as switching accounts?

Same thing happened to me. I have to log in to the account I want to switch to in Facebook first (safari and app). Then it lets me switch.

If anyone knows a better way, please share

In order to switch facebook games you need to either log into facebook using the app or thru safari, or uninstall the facebook app, log out of Facebook on safari and go to settings and delete your Facebook data. Its been a few years but the last time I used an ios you had to use safari so I'm not sure if it is still that way, ios is more restrictive than android.