Hmm, can you try updating your browser and/or try signing in using another phone/browser? If nothing works, tell us what other troubleshooting steps you've tried so far. Let us know how it goes!
Dear YouTube... The demonetisation of my channel, which has nearly 22K subs and over 1million views, so ever so slightly popular is a total farce .There are lots of channels the same as mine but monetised, so why mine, still waiting for a reason