With the Cyan update and latest preview it seems like it broke internet sharing idk if its just mine, but I can't share it, it always says internet sharing not available, has anyone had anything like this?
Re/install access point and network+ apps from Nokia. You can find them in Lumia System Updater or/& SysApp Pusher apps. They might fix it (fixed mine long time ago)
Access point probably does not work with the latest DP? I had similar problems with internet sharing in my 1520. I installed Nokia access point, but got only "not compatible with this OS version". I tried also to mess around with APN's, then just said fuuuuuckit did a hard reset and restore. Everything works now...
MIne is working but my friend's isn't. She also gets that "not compatible with this OS version" message. She had her access point reinstalled and it's working now.